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BIO 201 READING QUIZ 14 AND 15: COMPREHENSIVE REVIEW OF SENSORY
AND MOTOR SYSTEMS, AND THE AUTONOMIC NERVOUS SYSTEM-QUIZ
QUESTIONS WITH DETAILED EXPLANATIONS
READING QUIZ 14 | THE BRAIN AND CRANIAL NERVES
MULTIPLE-CHOICE QUESTIONS
Q1. Which functional division of the nervous system is primarily responsible for conscious
perception and voluntary motor responses?
A. Autonomic nervous system
B. Enteric nervous system
C. Somatic nervous system
D. Central nervous system
Bloom’s Level: Remember
Concept Tested: Somatic nervous system function
Correct Answer: Somatic nervous system
Explanation: The somatic nervous system enables conscious perception of the environment and
voluntary responses via skeletal muscles.
Q2. Our awareness of external stimuli and our planned reactions to them are made possible by
which functional division?
A. Autonomic division
B. Somatic division
C. Enteric division
D. Limbic system
Bloom’s Level: Understand
Concept Tested: Conscious perception of environment
Correct Answer: Somatic division
Explanation: The somatic nervous system is responsible for the conscious perception of the
environment and voluntary responses.
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Q3. The ability to consciously contract your biceps brachii to lift a book is governed by which
system?
A. Autonomic nervous system
B. Voluntary skeletal muscle control
C. Enteric nervous system
D. Sympathetic division
Bloom’s Level: Apply
Concept Tested: Voluntary skeletal muscle control
Correct Answer: Voluntary skeletal muscle control
Explanation: Voluntary control of skeletal muscles is a defining function of the somatic nervous
system.
Q4. In the withdrawal reflex from a hot stove, what is the correct sequence of signal
propagation?
A. Sensory neuron → CNS → motor neuron → muscle
B. Motor neuron → sensory neuron → muscle → CNS
C. Muscle → sensory neuron → CNS → motor neuron
D. CNS → sensory neuron → motor neuron → muscle
Bloom’s Level: Analyze
Concept Tested: Withdrawal reflex circuitry
Correct Answer: Sensory neuron → CNS → motor neuron → muscle
Explanation: The reflex arc begins with sensory activation, proceeds to central processing in the
spinal cord, and ends with motor output.
Q5. What reflex action extends the contralateral limb to maintain balance when the ipsilateral
limb is withdrawn?
A. Stretch reflex
B. Cross extensor reflex
C. Tendon reflex
D. Corneal reflex
Bloom’s Level: Remember
Concept Tested: Cross extensor reflex
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Correct Answer: Cross extensor reflex
Explanation: The cross extensor reflex provides counterbalancing movement on the opposite
side of the body during withdrawal.
Q6. The neural pathway that converts an environmental stimulus into a muscular action is known
as what?
A. Reflex arc
B. Stimulus-response motor pathway
C. Sensory transduction loop
D. Cognitive motor plan
Bloom’s Level: Understand
Concept Tested: Stimulus-response motor pathway
Correct Answer: Stimulus-response motor pathway
Explanation: This pathway involves sensory input, central processing, and motor output leading
to a response.
Q7. Which type of sensory neuron ending is primarily responsible for detecting pain and
temperature in the skin?
A. Encapsulated ending
B. Free nerve ending
C. Specialized receptor cell
D. Bulbous corpuscle
Bloom’s Level: Remember
Concept Tested: Free nerve ending pain
Correct Answer: Free nerve ending
Explanation: Neurons with free nerve endings in the dermis detect sensations like pain and
temperature.
Q8. Lamellated corpuscles are an example of neurons with what type of ending that respond to
pressure?
A. Free nerve endings
B. Specialized receptor cells
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C. Encapsulated nerve endings
D. Merkel discs
Bloom’s Level: Remember
Concept Tested: Encapsulated nerve ending touch
Correct Answer: Encapsulated nerve endings
Explanation: Encapsulated endings, like lamellated corpuscles, are connective tissue-
encapsulated neurons sensitive to pressure.
Q9. Rod cells in the retina are an example of which structural receptor classification?
A. Free nerve ending
B. Encapsulated ending
C. Specialized receptor cell
D. Interoceptor
Bloom’s Level: Remember
Concept Tested: Specialized receptor cell vision
Correct Answer: Specialized receptor cell
Explanation: Photoreceptors like rods are specialized receptor cells with distinct structures for
interpreting light.
Q10. A receptor located near a stimulus in the external environment, like in the skin, is classified
as what?
A. Interoceptor
B. Proprioceptor
C. Exteroceptor
D. Baroreceptor
Bloom’s Level: Understand
Concept Tested: Exteroceptor skin location
Correct Answer: Exteroceptor
Explanation: Exteroceptors, such as somatosensory receptors in the skin, interpret stimuli from
the external environment.
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Q11. Sensory receptors that monitor blood pressure in the aorta are best classified as which type?
A. Exteroceptor
B. Proprioceptor
C. Interoceptor
D. Photoreceptor
Bloom’s Level: Apply
Concept Tested: Interoceptor internal organ sensing
Correct Answer: Interoceptor
Explanation: Interoceptors interpret stimuli from internal organs and tissues, such as blood
vessels.
Q12. Which receptor type provides information about the position of body tissues as they move?
A. Exteroceptor
B. Interoceptor
C. Proprioceptor
D. Nociceptor
Bloom’s Level: Remember
Concept Tested: Proprioceptor joint position sense
Correct Answer: Proprioceptor
Explanation: Proprioceptors are located near moving body parts and interpret tissue position
during movement.
Q13. The perception of taste begins when a food molecule binds to what type of receptor on a
gustatory cell?
A. Mechanoreceptor
B. Chemoreceptor
C. Thermoreceptor
D. Photoreceptor
Bloom’s Level: Remember
Concept Tested: Chemoreceptor taste transduction
Correct Answer: Chemoreceptor
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Explanation: Taste is a chemical sense transduced by chemoreceptors that respond to dissolved
chemicals.
Q14. Hair cells in the inner ear that transduce sound waves and head movement are a type of
what?
A. Chemoreceptor
B. Photoreceptor
C. Mechanoreceptor
D. Thermoreceptor
Bloom’s Level: Remember
Concept Tested: Mechanoreceptor balance detection
Correct Answer: Mechanoreceptor
Explanation: Hearing and balance involve mechanoreceptors that respond to physical stimuli
like fluid movement.
Q15. A sensory receptor that is specifically sensitive to temperatures below normal body
temperature is a what?
A. Nociceptor
B. Osmoreceptor
C. Cold thermoreceptor
D. Warm thermoreceptor
Bloom’s Level: Understand
Concept Tested: Thermoreceptor cold sensitivity
Correct Answer: Cold thermoreceptor
Explanation: Thermoreceptors are specialized to detect either heat or cold relative to normal
body temperature.
Q16. Which receptor cell contains photopigment molecules that undergo chemical change when
struck by light?
A. Mechanoreceptor
B. Photoreceptor
C. Chemoreceptor
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D. Nociceptor
Bloom’s Level: Remember
Concept Tested: Photoreceptor light transduction
Correct Answer: Photoreceptor
Explanation: Photoreceptors in the retina transduce light energy into neural signals via
photopigments.
Q17. Intense stimuli from tissue damage are primarily interpreted by which type of sensory
receptor?
A. Osmoreceptor
B. Nociceptor
C. Mechanoreceptor
D. Proprioceptor
Bloom’s Level: Remember
Concept Tested: Nociceptor tissue damage signal
Correct Answer: Nociceptor
Explanation: Nociceptors are chemoreceptors that respond to chemicals released from tissue
damage, signaling pain.
Q18. Which receptor type would be activated by a change in the solute concentration of body
fluids?
A. Thermoreceptor
B. Osmoreceptor
C. Nociceptor
D. Baroreceptor
Bloom’s Level: Remember
Concept Tested: Osmoreceptor solute concentration sense
Correct Answer: Osmoreceptor
Explanation: Osmoreceptors respond to changes in the osmotic concentration of bodily fluids.
Q19. The savory taste associated with protein-rich foods like meat is known by what term?
A. Salty
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B. Sour
C. Umami
D. Bitter
Bloom’s Level: Remember
Concept Tested: Gustation fifth taste umami
Correct Answer: Umami
Explanation: Umami is the savory taste, recognized as the fifth basic taste, often triggered by L-
glutamate.
Q20. Which type of lingual papillae is pointed and filamentous, lacking taste buds?
A. Fungiform
B. Circumvallate
C. Foliate
D. Filiform
Bloom’s Level: Remember
Concept Tested: Filiform papillae no taste buds
Correct Answer: Filiform
Explanation: Filiform papillae are pointed structures that provide friction but do not contain
taste buds.
Q21. Large, dome-shaped papillae arranged in a V-shaped row on the posterior tongue are called
what?
A. Fungiform
B. Filiform
C. Circumvallate
D. Foliate
Bloom’s Level: Remember
Concept Tested: Circumvallate papillae posterior tongue
Correct Answer: Circumvallate
Explanation: Circumvallate papillae are located on the posterior tongue and contain numerous
taste buds.
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Q22. Mushroom-shaped papillae scattered across the anterior two-thirds of the tongue are known
as?
A. Foliate
B. Circumvallate
C. Fungiform
D. Filiform
Bloom’s Level: Remember
Concept Tested: Fungiform papillae anterior tongue
Correct Answer: Fungiform
Explanation: Fungiform papillae are mushroom-shaped and found primarily on the anterior
tongue surface.
Q23. Ridges and folds on the lateral margins of the tongue that contain taste buds are what type
of papillae?
A. Filiform
B. Fungiform
C. Circumvallate
D. Foliate
Bloom’s Level: Remember
Concept Tested: Foliate papillae lateral tongue
Correct Answer: Foliate
Explanation: Foliate papillae are folds on the lateral edges of the tongue that house taste buds.
Q24. When a taste molecule binds to its receptor on a gustatory cell, what is the immediate
result?
A. Hyperpolarization
B. Depolarization
C. Action potential in the cranial nerve
D. Release of saliva
Bloom’s Level: Understand
Concept Tested: Gustatory receptor cell depolarization
Correct Answer: Depolarization
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Explanation: Binding of a taste molecule typically leads to depolarization of the gustatory cell
membrane.
Q25. The diffusion of which ion into gustatory cells directly causes depolarization for salty
taste?
A. Potassium (K+)
B. Hydrogen (H+)
C. Chloride (Cl-)
D. Sodium (Na+)
Bloom’s Level: Remember
Concept Tested: Sodium ion salty taste
Correct Answer: Sodium (Na+)
Explanation: Salty taste perception results from Na+ ions entering gustatory cells, causing
depolarization.
Q26. Increasing the concentration of which ion in saliva is responsible for the perception of sour
taste?
A. Sodium (Na+)
B. Calcium (Ca2+)
C. Hydrogen (H+)
D. Potassium (K+)
Bloom’s Level: Remember
Concept Tested: Hydrogen ion sour taste
Correct Answer: Hydrogen (H+)
Explanation: Sour taste is the perception of increasing H+ concentration (decreasing pH) in the
saliva.
Q27. The sweet taste of glucose is transduced through which intracellular signaling mechanism?
A. Direct ion channel opening
B. G protein-coupled receptor activation
C. Tyrosine kinase receptor
D. Intracellular cAMP degradation
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Bloom’s Level: Understand
Concept Tested: G protein sweet transduction
Correct Answer: G protein-coupled receptor activation
Explanation: Sweet, bitter, and umami tastes involve G protein-coupled receptors that initiate
signal transduction.
Q28. The diverse and potentially toxic alkaloids found in coffee and tea primarily stimulate
which taste?
A. Sweet
B. Salty
C. Sour
D. Bitter
Bloom’s Level: Apply
Concept Tested: G protein bitter transduction
Correct Answer: Bitter
Explanation: Bitter taste often involves G protein-coupled receptors and may serve to detect
potentially harmful alkaloids.
Q29. The amino acid L-glutamate is the specific molecule that activates receptors for which
taste?
A. Sweet
B. Bitter
C. Umami
D. Sour
Bloom’s Level: Remember
Concept Tested: L-glutamate umami activation
Correct Answer: Umami
Explanation: The umami (savory) taste is activated when L-glutamate binds to its specific G
protein-coupled receptor.
Q30. Recent research suggests a possible sixth taste modality dedicated to detecting what type of
molecule?
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A. Proteins
B. Carbohydrates
C. Lipids (fats)
D. Nucleic acids
Bloom’s Level: Remember
Concept Tested: Lipid taste hypothesis
Correct Answer: Lipids (fats)
Explanation: Emerging evidence points to a potential sixth taste sense for detecting lipids.
Q31. Taste buds on the anterior third of the tongue send sensory information via which cranial
nerve?
A. Glossopharyngeal (IX)
B. Vagus (X)
C. Facial (VII)
D. Trigeminal (V)
Bloom’s Level: Remember
Concept Tested: Facial nerve taste anterior
Correct Answer: Facial (VII)
Explanation: The facial nerve (VII) innervates taste buds in the anterior two-thirds of the
tongue.
Q32. Which cranial nerve carries taste information from the posterior third of the tongue?
A. Facial (VII)
B. Vagus (X)
C. Glossopharyngeal (IX)
D. Hypoglossal (XII)
Bloom’s Level: Remember
Concept Tested: Glossopharyngeal nerve taste posterior
Correct Answer: Glossopharyngeal (IX)
Explanation: The glossopharyngeal nerve (IX) innervates taste buds in the posterior one-third of
the tongue.
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Q33. Taste buds at the extreme posterior of the tongue, important for the gag reflex, are served
by which nerve?
A. Facial (VII)
B. Glossopharyngeal (IX)
C. Vagus (X)
D. Trigeminal (V)
Bloom’s Level: Remember
Concept Tested: Vagus nerve gag reflex
Correct Answer: Vagus (X)
Explanation: The vagus nerve (X) connects to taste buds at the tongue's posterior extreme, near
the pharynx.
Q34. Bipolar olfactory sensory neurons are located within which specialized nasal region?
A. Vestibule
B. Olfactory epithelium
C. Nasal conchae
D. Pharyngeal tonsil
Bloom’s Level: Remember
Concept Tested: Olfactory epithelium nasal location
Correct Answer: Olfactory epithelium
Explanation: The olfactory epithelium is a small region in the superior nasal cavity containing
olfactory neurons.
Q35. Olfactory receptor neurons are unique among sensory neurons because they are what?
A. Unipolar
B. Bipolar
C. Multipolar
D. Pseudounipolar
Bloom’s Level: Remember
Concept Tested: Olfactory sensory neuron bipolar
Correct Answer: Bipolar
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Explanation: Each olfactory sensory neuron is a bipolar cell with dendrites extending into the
nasal mucus.
Q36. For an odor to be perceived, odorant molecules must first do what in the nasal cavity?
A. Bind directly to olfactory axons
B. Dissolve in the mucus lining
C. Evaporate into the sinuses
D. Be phagocytosed by support cells
Bloom’s Level: Understand
Concept Tested: Odorant mucus dissolution
Correct Answer: Dissolve in the mucus lining
Explanation: Airborne odorants dissolve into the mucus covering the olfactory epithelium to
reach receptor proteins.
Q37. Axons from olfactory neurons pass from the nasal cavity into the brain through which bony
structure?
A. Perpendicular plate
B. Cribriform plate
C. Palatine bone
D. Vomer
Bloom’s Level: Remember
Concept Tested: Cribriform plate axon passage
Correct Answer: Cribriform plate
Explanation: Olfactory axons project through foramina in the cribriform plate of the ethmoid
bone to enter the brain.
Q38. The bundle of olfactory axons forms the olfactory tract after synapsing in which structure?
A. Olfactory cortex
B. Olfactory bulb
C. Hypothalamus
D. Thalamus
Bloom’s Level: Remember
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Concept Tested: Olfactory bulb synaptic relay
Correct Answer: Olfactory bulb
Explanation: Olfactory receptor neuron axons synapse within the olfactory bulb on the brain's
ventral surface.
Q39. Conscious perception of smell occurs in which cortical area located in the temporal lobe?
A. Primary visual cortex
B. Primary olfactory cortex
C. Gustatory cortex
D. Somatosensory cortex
Bloom’s Level: Remember
Concept Tested: Primary olfactory cortex temporal
Correct Answer: Primary olfactory cortex
Explanation: The primary olfactory cortex, located in the temporal lobe, is responsible for
conscious smell perception.
Q40. The direct projection of olfactory pathways to which brain system explains why smells
trigger strong memories?
A. Reticular formation
B. Basal nuclei
C. Limbic system
D. Cerebellum
Bloom’s Level: Understand
Concept Tested: Limbic smell memory link
Correct Answer: Limbic system
Explanation: Olfactory projections to the limbic system and hypothalamus link smells with
emotion and memory.
Q41. Loss of the sense of smell, often from shearing of olfactory axons, is clinically known as
what?
A. Agnosia
B. Anosmia
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C. Aphasia
D. Ageusia
Bloom’s Level: Remember
Concept Tested: Anosmia blunt trauma cause
Correct Answer: Anosmia
Explanation: Anosmia, the loss of smell, can result from blunt force trauma that severs the
olfactory tract.
Q42. Why might an elderly person add more salt to their food compared to a younger individual?
A. Increased bitter sensitivity
B. Hyperactive gag reflex
C. Age-related anosmia
D. Loss of sweet receptors
Bloom’s Level: Apply
Concept Tested: Age-related olfactory decline
Correct Answer: Age-related anosmia
Explanation: Decreased olfactory neuron regeneration with age reduces smell sensitivity,
making food seem bland.
Q43. The fleshy, cartilaginous part of the external ear that funnels sound waves is called the
what?
A. Tympanic membrane
B. Pinna or auricle
C. External auditory meatus
D. Lobule
Bloom’s Level: Remember
Concept Tested: Auricle sound wave funnel
Correct Answer: Pinna or auricle
Explanation: The auricle (pinna) is the external ear structure that directs sound waves into the
auditory canal.
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Q44. The ear canal travels through the temporal bone to the eardrum via an opening called the
what?
A. Oval window
B. External auditory meatus
C. Internal acoustic meatus
D. Eustachian tube
Bloom’s Level: Remember
Concept Tested: External auditory meatus canal
Correct Answer: External auditory meatus
Explanation: The external auditory meatus is the bony canal leading from the auricle to the
tympanic membrane.
Q45. Sound waves cause the first vibration in the auditory system by moving which membrane?
A. Tectorial membrane
B. Basilar membrane
C. Tympanic membrane
D. Round window
Bloom’s Level: Remember
Concept Tested: Tympanic membrane vibration
Correct Answer: Tympanic membrane
Explanation: The tympanic membrane (eardrum) vibrates when struck by sound waves
collected by the external ear.
Q46. Which ossicle is directly attached to the medial surface of the tympanic membrane?
A. Incus
B. Stapes
C. Malleus
D. Cochlea
Bloom’s Level: Remember
Concept Tested: Malleus attached to eardrum
Correct Answer: Malleus
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Explanation: The malleus (hammer) ossicle is attached to the tympanic membrane and
articulates with the incus.
Q47. The middle ear bone that acts as an intermediary between the malleus and stapes is the
what?
A. Incus
B. Cochlea
C. Stapes
D. Auditory tube
Bloom’s Level: Remember
Concept Tested: Incus anvil middle ear
Correct Answer: Incus
Explanation: The incus (anvil) is the middle ossicle, connecting the malleus to the stapes.
Q48. Vibrations are transferred from the middle ear to the fluid of the inner ear at which
structure?
A. Round window
B. Tympanic membrane
C. Oval window
D. Eustachian tube
Bloom’s Level: Remember
Concept Tested: Stapes stirrup oval window
Correct Answer: Oval window
Explanation: The stapes (stirrup) transmits vibrations to the oval window, the entrance to the
fluid-filled cochlea.
Q49. The tube connecting the middle ear to the nasopharynx, which helps equalize air pressure,
is the what?
A. Cochlear duct
B. Eustachian tube
C. Semicircular canal
D. External auditory meatus
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Bloom’s Level: Remember
Concept Tested: Eustachian tube pressure equalization
Correct Answer: Eustachian tube
Explanation: The Eustachian tube connects the middle ear to the pharynx, allowing pressure
equalization across the eardrum.
Q50. The complex, fluid-filled network of canals within the temporal bone is collectively called
the what?
A. Tympanic cavity
B. Bony labyrinth
C. Membranous labyrinth
D. Ossicular chain
Bloom’s Level: Remember
Concept Tested: Bony labyrinth cochlea vestibule
Correct Answer: Bony labyrinth
Explanation: The inner ear's bony labyrinth houses the cochlea (hearing) and vestibule
(balance).
Q51. In the cochlea, which fluid-filled chamber extends from the oval window to the apex?
A. Scala tympani
B. Cochlear duct
C. Scala vestibuli
D. Vestibular duct
Bloom’s Level: Remember
Concept Tested: Scala vestibuli fluid chamber
Correct Answer: Scala vestibuli
Explanation: The scala vestibuli is the upper fluid-filled chamber beginning at the oval window.
Q52. The perilymph-filled chamber that extends from the apex of the cochlea back to the round
window is the?
A. Scala vestibuli
B. Cochlear duct
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C. Scala tympani
D. Utricle
Bloom’s Level: Remember
Concept Tested: Scala tympani fluid chamber
Correct Answer: Scala tympani
Explanation: The scala tympani is the lower fluid chamber that ends at the membrane-covered
round window.
Q53. The central, endolymph-filled chamber of the cochlea that houses the sound-transducing
apparatus is the?
A. Scala vestibuli
B. Scala tympani
C. Cochlear duct
D. Saccule
Bloom’s Level: Remember
Concept Tested: Cochlear duct organ of Corti
Correct Answer: Cochlear duct
Explanation: The cochlear duct contains the organ of Corti, the sensory organ for hearing.
Q54. The specific region of this membrane that vibrates is determined by the frequency of the
incoming sound wave.
A. Tectorial membrane
B. Tympanic membrane
C. Basilar membrane
D. Otolithic membrane
Bloom’s Level: Understand
Concept Tested: Basilar membrane frequency mapping
Correct Answer: Basilar membrane
Explanation: Different frequencies cause maximal vibration at specific locations along the
basilar membrane.
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Q55. The actual sensory receptors for sound, which sit atop the basilar membrane, are the what?
A. Hair cells
B. Ganglion cells
C. Supporting cells
D. Pillar cells
Bloom’s Level: Remember
Concept Tested: Organ of Corti hair cells
Correct Answer: Hair cells
Explanation: Hair cells within the organ of Corti are the mechanoreceptors that transduce fluid
movement into neural signals.
Q56. Bending of the stereocilia toward the tallest member opens ion channels due to tension on
what structures?
A. Microvilli
B. Protein tethers
C. Actin filaments
D. Cupula
Bloom’s Level: Understand
Concept Tested: Stereocilia tethered ion channels
Correct Answer: Protein tethers
Explanation: Protein fibers tether adjacent stereocilia together; bending stretches these tethers to
open ion channels.
Q57. During sound transduction, shear force is created as this gelatinous layer slides over the
stereocilia.
A. Basilar membrane
B. Tectorial membrane
C. Otolithic membrane
D. Cupula
Bloom’s Level: Remember
Concept Tested: Tectorial membrane shear force
Correct Answer: Tectorial membrane
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Explanation: The tectorial membrane overlies the hair cells, and its movement shears the
stereocilia.
Q58. Opening of ion channels in a hair cell's stereocilia leads to which change in membrane
potential?
A. Hyperpolarization
B. Depolarization
C. Repolarization
D. No change
Bloom’s Level: Understand
Concept Tested: Hair cell depolarization mechanism
Correct Answer: Depolarization
Explanation: Influx of cations (like K+) through open channels depolarizes the hair cell,
triggering neurotransmitter release.
Q59. The normal human range of hearing includes sound frequencies between what values?
A. 10–10,000 Hz
B. 20–20,000 Hz
C. 50–15,000 Hz
D. 100–5,000 Hz
Bloom’s Level: Remember
Concept Tested: Auditory range 20–20,000 Hz
Correct Answer: 20–20,000 Hz
Explanation: Human ears can typically detect sound waves with frequencies between 20 and
20,000 Hertz.
Q60. Which structure of the vestibular system detects linear acceleration of the head in the
horizontal plane?
A. Saccule
B. Utricle
C. Semicircular canals
D. Cochlea
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Bloom’s Level: Remember
Concept Tested: Utricle horizontal linear acceleration
Correct Answer: Utricle
Explanation: The utricle is sensitive to linear acceleration and head tilt in the horizontal plane.
Q61. Linear acceleration in the vertical plane, such as in an elevator, is primarily sensed by
which structure?
A. Utricle
B. Saccule
C. Ampullae
D. Cochlea
Bloom’s Level: Remember
Concept Tested: Saccule vertical linear acceleration
Correct Answer: Saccule
Explanation: The saccule detects linear acceleration and head position relative to gravity in the
vertical plane.
Q62. The otolithic membrane is heavy due to the presence of embedded crystals of what
compound?
A. Sodium chloride
B. Hydroxyapatite
C. Calcium carbonate
D. Potassium chloride
Bloom’s Level: Remember
Concept Tested: Otolith calcium carbonate crystals
Correct Answer: Calcium carbonate
Explanation: Calcium carbonate crystals (otoconia) make the otolithic membrane denser than
the surrounding fluid.
Q63. The sensory epithelium containing hair cells for detecting static head position and linear
acceleration is the?
A. Ampulla
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B. Macula
C. Cupula
D. Crista ampullaris
Bloom’s Level: Remember
Concept Tested: Macula gravity detection
Correct Answer: Macula
Explanation: The macula is the sensory patch in the utricle and saccule, covered by the otolithic
membrane.
Q64. Three nearly perpendicular fluid-filled tubes that detect rotational head movements are the
what?
A. Cochlear ducts
B. Semicircular canals
C. Scalae
D. Eustachian tubes
Bloom’s Level: Remember
Concept Tested: Semicircular canals rotational sensing
Correct Answer: Semicircular canals
Explanation: The three semicircular canals, each in a different plane, sense rotational
acceleration of the head.
Q65. The enlarged region at the base of each semicircular canal that houses the sensory crista is
the what?
A. Macula
B. Utricle
C. Ampulla
D. Saccule
Bloom’s Level: Remember
Concept Tested: Ampulla end of canal
Correct Answer: Ampulla
Explanation: Each semicircular canal has an ampulla containing the hair cells and cupula for
transduction.
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Q66. The gelatinous structure into which stereocilia of rotational equilibrium hair cells are
embedded is the?
A. Otolithic membrane
B. Tectorial membrane
C. Cupula
D. Basilar membrane
Bloom’s Level: Remember
Concept Tested: Cupula gelatinous cap
Correct Answer: Cupula
Explanation: The cupula is a gelatinous cap in the ampulla that is displaced by endolymph flow
during rotation.
Q67. When you turn your head to the left, fluid inertia in the semicircular canals causes the
cupula to bend in which direction relative to head movement?
A. Same direction
B. Opposite direction
C. Upward
D. It does not bend
Bloom’s Level: Analyze
Concept Tested: Rotational head movement coding
Correct Answer: Opposite direction
Explanation: Endolymph lags due to inertia, deflecting the cupula in the direction opposite to
the head's rotation.
Q68. Which type of cutaneous mechanoreceptor, located in the stratum basale, responds to light
touch and low-frequency vibration?
A. Lamellated corpuscle
B. Tactile corpuscle
C. Merkel cells (discs)
D. Bulbous corpuscle
Bloom’s Level: Remember
Concept Tested: Merkel cells light touch
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Correct Answer: Merkel cells (discs)
Explanation: Merkel cells (Type I) are unencapsulated receptors in the epidermis sensitive to
light touch and pressure.
Q69. Deep pressure and high-frequency vibration are sensed by which large, onion-like
encapsulated receptor?
A. Meissner's corpuscle
B. Ruffini ending
C. Merkel disc
D. Lamellated (Pacinian) corpuscle
Bloom’s Level: Remember
Concept Tested: Lamellated corpuscles deep pressure
Correct Answer: Lamellated (Pacinian) corpuscle
Explanation: Pacinian corpuscles are deep receptors with concentric layers sensitive to deep
pressure and vibration.
Q70. Light touch, especially in hairless areas like fingertips, is primarily transduced by which
encapsulated receptor?
A. Ruffini corpuscle
B. Tactile (Meissner's) corpuscle
C. Merkel disc
D. Free nerve ending
Bloom’s Level: Remember
Concept Tested: Tactile corpuscles Meissner’s
Correct Answer: Tactile (Meissner's) corpuscle
Explanation: Meissner's corpuscles are encapsulated receptors in the dermal papillae sensitive
to light touch.
Q71. A network of nerve endings wrapped around a hair follicle that detects hair movement is
called the?
A. Merkel disc
B. Hair follicle plexus
27
C. Tactile corpuscle
D. Lamellated corpuscle
Bloom’s Level: Remember
Concept Tested: Hair follicle plexus movement
Correct Answer: Hair follicle plexus
Explanation: The hair follicle plexus is a nerve ending network that senses displacement of hair
shafts.
Q72. Stretching of the skin is detected by which type of slowly adapting, encapsulated receptor?
A. Meissner's corpuscle
B. Pacinian corpuscle
C. Bulbous (Ruffini) corpuscle
D. Merkel disc
Bloom’s Level: Remember
Concept Tested: Bulbous corpuscles Ruffini stretch
Correct Answer: Bulbous (Ruffini) corpuscle
Explanation: Ruffini endings (Type II) are stretch receptors in the dermis and joint capsules.
Q73. The sensory receptor within a muscle that monitors its length and rate of stretch is the
what?
A. Golgi tendon organ
B. Muscle spindle
C. Free nerve ending
D. Pacinian corpuscle
Bloom’s Level: Remember
Concept Tested: Muscle spindle length detector
Correct Answer: Muscle spindle
Explanation: Muscle spindles are proprioceptors within skeletal muscle that sense stretch and
help maintain tone.
Q74. Tension on a tendon, signaling the force of muscle contraction, is monitored by which
receptor?
28
A. Muscle spindle
B. Golgi tendon organ
C. Ruffini ending
D. Joint capsule receptor
Bloom’s Level: Remember
Concept Tested: Golgi tendon organ tension
Correct Answer: Golgi tendon organ
Explanation: Golgi tendon organs are proprioceptors within tendons that sense tension and
inhibit excessive contraction.
Q75. The outermost layer of the eyeball, consisting of the opaque sclera and transparent cornea,
is the?
A. Vascular tunic
B. Neural tunic
C. Fibrous tunic
D. Conjunctiva
Bloom’s Level: Remember
Concept Tested: Fibrous tunic sclera cornea
Correct Answer: Fibrous tunic
Explanation: The fibrous tunic is the eye's outer layer, providing structure and protection.
Q76. The middle layer of the eye, which is highly vascular and includes the choroid and ciliary
body, is the?
A. Neural tunic
B. Fibrous tunic
C. Vascular tunic
D. Sclera
Bloom’s Level: Remember
Concept Tested: Vascular tunic choroid ciliary
Correct Answer: Vascular tunic
Explanation: The vascular tunic (uvea) supplies blood and includes the choroid, ciliary body,
and iris.
29
Q77. The innermost layer of the eye, which contains the photoreceptors and neural circuitry, is
the?
A. Fibrous tunic
B. Vascular tunic
C. Neural tunic
D. Conjunctiva
Bloom’s Level: Remember
Concept Tested: Neural tunic retina layer
Correct Answer: Neural tunic
Explanation: The neural tunic is the retina, containing the photoreceptors, bipolar cells, and
ganglion cells.
Q78. The clear, watery fluid that fills the anterior chamber between the cornea and the lens is
called?
A. Vitreous humor
B. Aqueous humor
C. Endolymph
D. Perilymph
Bloom’s Level: Remember
Concept Tested: Aqueous humor anterior chamber
Correct Answer: Aqueous humor
Explanation: The aqueous humor fills the anterior cavity, nourishing the cornea and lens and
maintaining pressure.
Q79. The jelly-like substance that fills the large posterior chamber of the eyeball is the what?
A. Aqueous humor
B. Vitreous humor
C. Perilymph
D. Endolymph
Bloom’s Level: Remember
Concept Tested: Vitreous humor posterior chamber
Correct Answer: Vitreous humor
30
Explanation: The vitreous humor is a viscous fluid that fills the space between the lens and
retina.
Q80. The central point of the retina with the highest density of cones and no blood vessels is the?
A. Optic disc
B. Fovea centralis
C. Macula lutea
D. Ora serrata
Bloom’s Level: Remember
Concept Tested: Fovea centralis visual acuity
Correct Answer: Fovea centralis
Explanation: The fovea is a depression in the retina where photoreceptors are densely packed
for sharp central vision.
Q81. The point where the optic nerve exits the eye, creating a natural blind spot, is the?
A. Fovea
B. Macula
C. Optic disc
D. Lens
Bloom’s Level: Remember
Concept Tested: Optic disc blind spot
Correct Answer: Optic disc
Explanation: The optic disc lacks photoreceptors because RGC axons and blood vessels exit the
eye there.
Q82. The photopigment found in rod photoreceptors, specialized for low-light vision, is called?
A. Opsin
B. Rhodopsin
C. Iodopsin
D. Photopsin
Bloom’s Level: Remember
Concept Tested: Rhodopsin rod photopigment
31
Correct Answer: Rhodopsin
Explanation: Rhodopsin is the photopigment in rods, most sensitive to blue-green light (498
nm).
Q83. The protein component of cone photopigments that determines its specific wavelength
sensitivity is the?
A. Retinal
B. Opsin
C. Rhodopsin
D. Transducin
Bloom’s Level: Remember
Concept Tested: Opsin cone photopigment
Correct Answer: Opsin
Explanation: Different opsin proteins in cones bind retinal to create photopigments sensitive to
red, green, or blue light.
Q84. Before absorbing a photon, the retinal molecule in a photopigment is in which isomeric
form?
A. All-trans-retinal
B. 11-cis-retinal
C. 13-cis-retinal
D. 9-cis-retinal
Bloom’s Level: Remember
Concept Tested: 11-cis-retinal inactive form
Correct Answer: 11-cis-retinal
Explanation: In the dark, retinal is in the bent 11-cis isomer, which is converted to all-trans by
light energy.
Q85. Absorption of a photon causes retinal to change to which straight-chain isomeric form?
A. 11-cis-retinal
B. All-trans-retinal
C. 13-cis-retinal
32
D. 9-cis-retinal
Bloom’s Level: Remember
Concept Tested: All-trans-retinal activated form
Correct Answer: All-trans-retinal
Explanation: Photoisomerization converts 11-cis-retinal to the straight all-trans-retinal,
initiating the visual signal.
Q86. The process by which light energy changes the shape of the retinal molecule is called
what?
A. Transduction
B. Photoisomerization
C. Bleaching
D. Depolarization
Bloom’s Level: Remember
Concept Tested: Photoisomerization light trigger
Correct Answer: Photoisomerization
Explanation: Photoisomerization is the light-induced change in retinal's conformation from cis
to trans.
Q87. The theory that color vision results from the combined activity of three cone types is called
what?
A. Opponent-process theory
B. Trichromatic theory
C. Frequency theory
D. Place theory
Bloom’s Level: Remember
Concept Tested: Trichromatic color vision theory
Correct Answer: Trichromatic theory
Explanation: Trichromatic theory posits that three cone types (red, green, blue) enable color
vision through their relative activation.
33
Q88. The axons of which retinal neurons converge to form the optic nerve?
A. Photoreceptors
B. Bipolar cells
C. Amacrine cells
D. Retinal ganglion cells (RGCs)
Bloom’s Level: Remember
Concept Tested: Retinal ganglion cell output
Correct Answer: Retinal ganglion cells (RGCs)
Explanation: RGC axons collect at the optic disc and exit the eye as the optic nerve, carrying
visual information to the brain.
Q89. In the retina, which neuron type provides a direct relay of information from photoreceptors
to ganglion cells?
A. Horizontal cells
B. Amacrine cells
C. Bipolar cells
D. Photoreceptors
Bloom’s Level: Remember
Concept Tested: Bipolar cell retinal relay
Correct Answer: Bipolar cells
Explanation: Bipolar cells connect photoreceptors to retinal ganglion cells in the visual
pathway.
Q90. Retinal cells that contribute to early image processing through lateral inhibition in the inner
synaptic layer are?
A. Bipolar cells
B. Horizontal cells
C. Amacrine cells
D. Photoreceptors
Bloom’s Level: Remember
Concept Tested: Amacrine cell lateral inhibition
Correct Answer: Amacrine cells
34
Explanation: Amacrine cells interact with bipolar cells and RGCs to modulate signals via lateral
connections.
Q91. Contraction of which extraocular muscle causes the eye to look upward (elevation)?
A. Inferior rectus
B. Superior rectus
C. Lateral rectus
D. Superior oblique
Bloom’s Level: Remember
Concept Tested: Superior rectus eye elevation
Correct Answer: Superior rectus
Explanation: The superior rectus muscle elevates the eye when it contracts.
Q92. Which of the six extraocular muscles is primarily responsible for depressing the eye
(looking down)?
A. Superior rectus
B. Inferior oblique
C. Inferior rectus
D. Superior oblique
Bloom’s Level: Remember
Concept Tested: Inferior rectus eye depression
Correct Answer: Inferior rectus
Explanation: The inferior rectus muscle depresses the eyeball.
Q93. Adduction of the eye (moving it medially toward the nose) is the primary action of which
muscle?
A. Lateral rectus
B. Medial rectus
C. Superior oblique
D. Inferior oblique
Bloom’s Level: Remember
Concept Tested: Medial rectus adduction
35
Correct Answer: Medial rectus
Explanation: The medial rectus adducts the eye.
Q94. The extraocular muscle responsible for moving the eye laterally (abduction) is the what?
A. Medial rectus
B. Lateral rectus
C. Superior rectus
D. Inferior rectus
Bloom’s Level: Remember
Concept Tested: Lateral rectus abduction
Correct Answer: Lateral rectus
Explanation: The lateral rectus abducts the eye and is innervated by the abducens nerve (VI).
Q95. Which muscle, after its tendon passes through the trochlea, causes the eye to rotate
medially and look down?
A. Superior rectus
B. Inferior rectus
C. Superior oblique
D. Inferior oblique
Bloom’s Level: Remember
Concept Tested: Superior oblique intorsion
Correct Answer: Superior oblique
Explanation: The superior oblique muscle intorts (medially rotates) and depresses the eye.
Q96. The extraocular muscle that originates from the floor of the orbit and causes lateral rotation
of the eye is the?
A. Superior oblique
B. Inferior oblique
C. Lateral rectus
D. Medial rectus
Bloom’s Level: Remember
Concept Tested: Inferior oblique extorsion
36
Correct Answer: Inferior oblique
Explanation: The inferior oblique extorts (laterally rotates) and elevates the eye.
Q97. Retracting and elevating the upper eyelid is the function of which muscle, innervated by
the oculomotor nerve?
A. Orbicularis oculi
B. Levator palpebrae superioris
C. Superior rectus
D. Corrugator supercilii
Bloom’s Level: Remember
Concept Tested: Levator palpebrae eyelid lift
Correct Answer: Levator palpebrae superioris
Explanation: The levator palpebrae superioris opens the eye by lifting the upper eyelid.
Q98. In the dorsal column system, sensory axons from the lower body and legs travel in which
tract?
A. Fasciculus cuneatus
B. Fasciculus gracilis
C. Spinothalamic tract
D. Medial lemniscus
Bloom’s Level: Remember
Concept Tested: Fasciculus gracilis leg input
Correct Answer: Fasciculus gracilis
Explanation: The fasciculus gracilis carries fine touch and proprioceptive information from the
lower limbs.
Q99. Which ascending tract in the dorsal column carries similar sensory information from the
upper body and arms?
A. Fasciculus gracilis
B. Fasciculus cuneatus
C. Lateral corticospinal tract
D. Spinocerebellar tract
37
Bloom’s Level: Remember
Concept Tested: Fasciculus cuneatus arm input
Correct Answer: Fasciculus cuneatus
Explanation: The fasciculus cuneatus carries fine touch and proprioception from the upper
limbs and trunk.
Q100. After synapsing in the medulla, second-order neurons from the dorsal column nuclei cross
the midline and form the?
A. Spinal trigeminal tract
B. Medial lemniscus
C. Spinothalamic tract
D. Corticospinal tract
Bloom’s Level: Remember
Concept Tested: Medial lemniscus decussated tract
Correct Answer: Medial lemniscus
Explanation: The medial lemniscus is the tract of decussated axons from the gracile and cuneate
nuclei ascending to the thalamus.
MULTIPLE-CHOICE QUESTIONS
Q1. The spinothalamic tract primarily transmits fine touch and proprioceptive sensations from
the spinal cord to the thalamus.
Answer: False
Bloom’s Level: Remember
Concept Tested: Spinothalamic pain temperature path
Justification: The spinothalamic tract is primarily responsible for transmitting pain and
temperature sensations, not fine touch.
Q2. The spinal trigeminal nucleus in the medulla processes pain and temperature sensations from
the face.
Answer: True
Bloom’s Level: Remember
Concept Tested: Spinal trigeminal nucleus pain
38
Justification: The spinal trigeminal nucleus receives information similar to the spinothalamic
tract, such as pain and temperature from the face.
Q3. The chief sensory nucleus in the pons is a relay for gustatory (taste) information.
Answer: False
Bloom’s Level: Understand
Concept Tested: Chief sensory nucleus touch
Justification: The chief sensory nucleus receives touch, pressure, vibration, and proprioceptive
information from the face, not taste.
Q4. The mesencephalic nuclei in the midbrain process proprioceptive information from the
muscles of mastication.
Answer: True
Bloom’s Level: Remember
Concept Tested: Mesencephalic nucleus proprioception
Justification: The mesencephalic nuclei receive proprioceptive information, such as from the
jaw muscles involved in chewing.
Q5. The solitary nucleus in the brain stem is the first central relay for gustatory information
carried by the facial and glossopharyngeal nerves.
Answer: True
Bloom’s Level: Remember
Concept Tested: Solitary nucleus taste relay
Justification: Taste information synapses in the solitary nucleus before projecting to the
thalamus.
Q6. The cochlear nuclei are located in the midbrain and are the first site of binaural auditory
processing.
Answer: False
Bloom’s Level: Understand
Concept Tested: Cochlear nuclei sound processing
Justification: The cochlear nuclei are located in the superior medulla, not the midbrain, and
initial sound processing occurs there.
39
Q7. The inferior colliculus is an auditory relay nucleus in the midbrain that projects to the medial
geniculate nucleus.
Answer: True
Bloom’s Level: Remember
Concept Tested: Inferior colliculus auditory midbrain
Justification: The inferior colliculus is a midbrain structure in the auditory pathway that sends
information to the thalamus.
Q8. The superior colliculus integrates auditory and somatosensory information to coordinate
reflexive head and eye movements.
Answer: True
Bloom’s Level: Understand
Concept Tested: Superior colliculus visual-motor integration
Justification: The superior colliculus receives visual, auditory, and somatosensory input to
initiate orienting movements.
Q9. The medial geniculate nucleus in the thalamus is the primary relay center for visual
information to the occipital cortex.
Answer: False
Bloom’s Level: Remember
Concept Tested: Medial geniculate nucleus thalamus
Justification: The medial geniculate nucleus is the thalamic relay for auditory information, not
visual.
Q10. The lateral geniculate nucleus receives all visual input from the retina and projects it to the
primary visual cortex.
Answer: True
Bloom’s Level: Remember
Concept Tested: Lateral geniculate nucleus vision
Justification: The lateral geniculate nucleus is the thalamic target for RGC axons and projects to
the visual cortex.
40
Q11. At the optic chiasm, all axons from the left and right optic nerves cross to the opposite side
of the brain.
Answer: False
Bloom’s Level: Understand
Concept Tested: Optic chiasm partial decussation
Justification: Only axons from the nasal (medial) halves of each retina decussate at the chiasm;
temporal axons remain ipsilateral.
Q12. The right primary visual cortex processes visual information from the entire right eye.
Answer: False
Bloom’s Level: Analyze
Concept Tested: Contralateral visual field coding
Justification: Each visual cortex processes the contralateral visual field, which receives input
from both eyes.
Q13. Bilateral hemianopia, the loss of lateral peripheral vision, can be caused by a pituitary
tumor compressing the optic tracts.
Answer: False
Bloom’s Level: Apply
Concept Tested: Bilateral hemianopia pituitary compression
Justification: A pituitary tumor compresses the optic chiasm, affecting crossing fibers and
causing loss of lateral visual fields.
Q14. The suprachiasmatic nucleus regulates circadian rhythms based on visual input from
specialized photosensitive retinal ganglion cells.
Answer: True
Bloom’s Level: Remember
Concept Tested: Suprachiasmatic nucleus circadian rhythm
Justification: The SCN receives input from photosensitive RGCs to help establish the body's
daily cycle.
Q15. The sensory homunculus on the postcentral gyrus is a perfectly scaled map of the human
body.
41
Answer: False
Bloom’s Level: Understand
Concept Tested: Sensory homunculus distorted map
Justification: The homunculus is distorted, exaggerating areas with high receptor density like
the lips and hands.
Q16. In the motor homunculus on the precentral gyrus, the hands are represented by a
disproportionately small region.
Answer: False
Bloom’s Level: Remember
Concept Tested: Motor homunculus hand exaggeration
Justification: The motor homunculus exaggerates regions controlling muscles for fine, precise
movements, like the hands and face.
Q17. The premotor cortex is primarily responsible for executing commands that directly
stimulate spinal motor neurons.
Answer: False
Bloom’s Level: Understand
Concept Tested: Premotor cortex posture planning
Justification: The premotor cortex is involved in planning and coordinating movements,
including postural adjustments, not direct execution.
Q18. The supplemental motor area is important for planning and coordinating complex
sequences of learned movements.
Answer: True
Bloom’s Level: Remember
Concept Tested: Supplemental motor area sequencing
Justification: The supplemental motor area manages sequential movements based on prior
experience.
Q19. The frontal eye fields control voluntary eye movements, such as saccades, via connections
to the superior colliculus.
Answer: True
42
Bloom’s Level: Remember
Concept Tested: Frontal eye fields saccades
Justification: The frontal eye fields are responsible for moving the eyes in response to visual
stimuli and project to the superior colliculus.
Q20. Broca's area, located in the temporal lobe, is essential for language comprehension.
Answer: False
Bloom’s Level: Remember
Concept Tested: Broca’s area speech articulation
Justification: Broca's area is in the frontal lobe and is involved in speech production, not
comprehension.
Q21. Betz cells are lower motor neurons located in the ventral horn of the spinal cord.
Answer: False
Bloom’s Level: Remember
Concept Tested: Betz cells upper motor neurons
Justification: Betz cells are large upper motor neurons in the primary motor cortex whose axons
project to the spinal cord or brain stem.
Q22. The corticobulbar tract carries motor commands from the cortex to skeletal muscles of the
limbs.
Answer: False
Bloom’s Level: Understand
Concept Tested: Corticobulbar tract cranial output
Justification: The corticobulbar tract projects from the cortex to motor nuclei of cranial nerves
in the brain stem.
Q23. The pyramidal decussation refers to the crossing of corticospinal tract fibers in the
midbrain.
Answer: False
Bloom’s Level: Remember
Concept Tested: Pyramidal decussation medulla crossing
43
Justification: The pyramidal decussation is where most corticospinal tract fibers cross the
midline in the medulla.
Q24. The lateral corticospinal tract controls axial and postural musculature of the trunk.
Answer: False
Bloom’s Level: Understand
Concept Tested: Lateral corticospinal appendicular control
Justification: The lateral corticospinal tract controls appendicular muscles of the limbs, not axial
muscles.
Q25. The anterior corticospinal tract does not decussate and therefore controls ipsilateral trunk
muscles.
Answer: False
Bloom’s Level: Analyze
Concept Tested: Anterior corticospinal axial control
Justification: The anterior tract does decussate, but at the spinal cord level, and it influences
axial muscles bilaterally.
Q26. The tectospinal tract originates in the superior colliculus and mediates reflexive head
turning toward visual stimuli.
Answer: True
Bloom’s Level: Remember
Concept Tested: Tectospinal tract head turning
Justification: This extrapyramidal tract starts at the superior colliculus (tectum) and coordinates
head and neck movements.
Q27. The reticulospinal tract influences muscle tone and autonomic functions related to posture
and locomotion.
Answer: True
Bloom’s Level: Remember
Concept Tested: Reticulospinal tract posture modulation
Justification: This tract connects the reticular formation to the spinal cord, modulating posture,
movement, and autonomic functions.
44
Q28. The vestibulospinal tract carries equilibrium information from the vestibular nuclei to the
spinal cord to modulate balance.
Answer: True
Bloom’s Level: Remember
Concept Tested: Vestibulospinal tract balance output
Justification: This tract helps maintain balance and posture by transmitting vestibular signals to
spinal motor neurons.
Q29. The vestibulo-ocular reflex (VOR) stabilizes images on the retina by moving the eyes
opposite to head movement.
Answer: True
Bloom’s Level: Understand
Concept Tested: Vestibulo-ocular reflex stabilization
Justification: The VOR uses input from the vestibular system to coordinate eye movements that
compensate for head motion.
Q30. The rubrospinal tract originates in the red nucleus and delivers corrective motor commands
based on cerebellar processing.
Answer: True
Bloom’s Level: Remember
Concept Tested: Rubrospinal tract cerebellar correction
Justification: The red nucleus receives cerebellar output and sends corrective signals via the
rubrospinal tract.
Q31. The corneal reflex arc involves the trigeminal nerve for the sensory limb and the facial
nerve for the motor response.
Answer: True
Bloom’s Level: Apply
Concept Tested: Corneal blink reflex arc
Justification: Tactile stimulation of the cornea is sensed by the trigeminal nerve (V), and
blinking is executed via the facial nerve (VII).
45
Q32. The stretch reflex, such as the knee-jerk, is initiated by activation of Golgi tendon organs.
Answer: False
Bloom’s Level: Remember
Concept Tested: Stretch reflex muscle spindle
Justification: The stretch reflex is initiated by muscle spindles, not Golgi tendon organs, which
respond to tension.
Q33. Tapping the patellar tendon with a hammer stretches the quadriceps muscle and stimulates
its muscle spindles.
Answer: True
Bloom’s Level: Understand
Concept Tested: Patellar tendon knee jerk
Justification: The patellar reflex tests the L2-L4 spinal segments by stretching the quadriceps
and activating its spindles.
Q34. Most cranial nerve sensory pathways project ipsilaterally to the brain, meaning information
from the right side of the head goes to the right side of the brain.
Answer: True
Bloom’s Level: Remember
Concept Tested: Ipsilateral cranial nerve projection
Justification: Cranial nerve systems are mostly ipsilateral, unlike spinal sensory pathways which
are mostly contralateral.
Q35. Somatosensory information from the right hand is processed by the left primary
somatosensory cortex.
Answer: True
Bloom’s Level: Remember
Concept Tested: Contralateral spinal projection
Justification: Sensory information from the body below the neck decussates, so the left cortex
processes the right side of the body.
Q36. The dorsal column-medial lemniscus pathway carries sensations of crude touch and
temperature.
46
Answer: False
Bloom’s Level: Remember
Concept Tested: Dorsal column fine touch
Justification: The dorsal column system is responsible for fine touch, vibration, and
proprioception, not crude touch/temperature.
Q37. Somatosensory information from the face travels to the thalamus via the trigeminothalamic
tract.
Answer: True
Bloom’s Level: Remember
Concept Tested: Trigeminothalamic facial sensation
Justification: Second-order neurons from trigeminal nuclei decussate and ascend to the
thalamus in this tract.
Q38. The primary gustatory cortex, where taste is consciously perceived, is located in the frontal
lobe.
Answer: False
Bloom’s Level: Remember
Concept Tested: Gustatory cortex insular region
Justification: The gustatory cortex is located in the insula, which is part of the cerebral cortex
deep within the lateral sulcus.
Q39. The ventral ("what") visual stream projects from the occipital lobe to the temporal lobe for
object recognition.
Answer: True
Bloom’s Level: Remember
Concept Tested: Ventral stream object identity
Justification: The ventral stream is concerned with identifying visual stimuli and projects to
temporal lobe structures.
Q40. The dorsal ("where") visual stream projects from the occipital lobe to the parietal lobe to
guide movements relative to visual space.
Answer: True
47
Bloom’s Level: Remember
Concept Tested: Dorsal stream spatial location
Justification: The dorsal stream processes spatial location and motion, projecting to the parietal
lobe to guide action.
Q41. Binocular depth perception relies on the fact that each eye sees a slightly different image, a
phenomenon called retinal disparity.
Answer: True
Bloom’s Level: Understand
Concept Tested: Binocular depth retinal disparity
Justification: The brain uses the disparity between the two retinal images to perceive depth in
three dimensions.
Q42. The monocular depth cue known as relative size helps us judge distance because closer
objects appear larger.
Answer: True
Bloom’s Level: Understand
Concept Tested: Monocular depth relative size
Justification: Relative size is a monocular cue where the perceived size of an object based on
past experience helps estimate distance.
Q43. In the fovea, a single retinal ganglion cell receives input from a single cone photoreceptor.
Answer: True
Bloom’s Level: Remember
Concept Tested: Foveal one-to-one RGC mapping
Justification: This one-to-one connection in the fovea allows for high visual acuity, with
minimal convergence.
Q44. In the peripheral retina, a single retinal ganglion cell receives input from only one rod
photoreceptor.
Answer: False
Bloom’s Level: Analyze
Concept Tested: Peripheral retinal convergence
48
Justification: In the periphery, many photoreceptors converge onto a single RGC, increasing
light sensitivity but reducing acuity.
Q45. Capsaicin, the molecule in chili peppers, activates thermoreceptors that are sensitive to cold
temperatures.
Answer: False
Bloom’s Level: Apply
Concept Tested: Capsaicin nociceptor activation
Justification: Capsaicin activates a specific transmembrane ion channel on nociceptors that is
sensitive to heat and pain, not cold.
Q46. Alkaloids, which often taste bitter, may have evolved as a detection mechanism for
potentially toxic plant compounds.
Answer: True
Bloom’s Level: Evaluate
Concept Tested: Alkaloid bitter poison detection
Justification: Bitter taste may stimulate the gag reflex to avoid ingesting poisonous alkaloids
found in some plants.
Q47. Gustatory receptor cells release neurotransmitters onto sensory neuron dendrites when
activated by taste molecules.
Answer: True
Bloom’s Level: Remember
Concept Tested: Taste bud neurotransmitter release
Justification: Activated gustatory cells release neurotransmitters that stimulate the cranial nerve
fibers they synapse with.
Q48. Olfactory sensory neurons are unique because they cannot be replaced once they are
damaged or die.
Answer: False
Bloom’s Level: Understand
Concept Tested: Olfactory neuron regeneration capacity
49
Justification: Olfactory neurons are regularly replaced within the nasal epithelium, though this
ability decreases with age.
Q49. In a hair cell of the inner ear, the stereocilia are arranged in rows of increasing height, and
the tallest row is closest to the kinocilium.
Answer: True
Bloom’s Level: Remember
Concept Tested: Hair cell stereocilia tallest row
Justification: Stereocilia are arrayed from shortest to tallest, with deflection toward the tallest
causing depolarization.
Q50. The round window is a membrane-covered opening that releases pressure from the fluid
waves in the scala tympani.
Answer: True
Bloom’s Level: Remember
Concept Tested: Round window fluid pressure release
Justification: The round window bulges outward to dissipate pressure waves that have traveled
through the cochlear fluid.
Q51. The footplate of the stapes ossicle transmits vibrations directly to the fluid of the cochlea at
the oval window.
Answer: True
Bloom’s Level: Remember
Concept Tested: Oval window stapes interface
Justification: The stapes is attached to the oval window, which is the entry point for vibrations
into the fluid-filled scala vestibuli.
Q52. Zonule fibers are elastic ligaments that connect the ciliary body to the cornea, changing its
shape for focus.
Answer: False
Bloom’s Level: Understand
Concept Tested: Zonule fibers lens suspension
50
Justification: Zonule fibers suspend the lens from the ciliary body; contraction of the ciliary
body changes lens shape, not corneal shape.
Q53. Contraction of the ciliary body muscles relaxes the zonule fibers, allowing the lens to
become more rounded for near vision.
Answer: True
Bloom’s Level: Apply
Concept Tested: Ciliary body lens accommodation
Justification: This process, called accommodation, increases the lens's refractive power to focus
on close objects.
Q54. The iris contains smooth muscle; the sphincter pupillae contracts in response to dim light to
dilate the pupil.
Answer: False
Bloom’s Level: Understand
Concept Tested: Iris sphincter pupil constriction
Justification: The sphincter pupillae constricts the pupil in bright light; the dilator pupillae
dilates it in dim light.
Q55. The dilator pupillae muscles are controlled by parasympathetic fibers from the oculomotor
nerve.
Answer: False
Bloom’s Level: Remember
Concept Tested: Iris dilator pupil dilation
Justification: Pupil dilation is a sympathetic response; the dilator muscles are not controlled by
the parasympathetic oculomotor nerve.
Q56. The palpebral conjunctiva is a membrane that lines the inner surface of the eyelids and
reflects onto the anterior surface of the sclera.
Answer: True
Bloom’s Level: Remember
Concept Tested: Palpebral conjunctiva eyelid lining
51
Justification: The conjunctiva lines the eyelids and covers the anterior eyeball, excluding the
cornea.
Q57. The lacrimal gland, located superior and lateral to the orbit, produces tears that drain into
the nasal cavity via the nasolacrimal duct.
Answer: True
Bloom’s Level: Remember
Concept Tested: Lacrimal gland tear production
Justification: Tears wash across the eye and drain through the lacrimal duct into the nasal
cavity.
Q58. The trochlea is a cartilaginous loop through which the tendon of the inferior oblique muscle
passes.
Answer: False
Bloom’s Level: Remember
Concept Tested: Trochlea superior oblique pulley
Justification: The trochlea is the pulley for the tendon of the superior oblique muscle, not the
inferior oblique.
Q59. The red nucleus, located in the midbrain, gives rise to the rubrospinal tract which corrects
movement errors.
Answer: True
Bloom’s Level: Remember
Concept Tested: Red nucleus rubrospinal origin
Justification: The red nucleus receives cerebellar input and sends corrective motor commands
via the rubrospinal tract.
Q60. The cerebellum compares intended motor commands from the cortex with proprioceptive
feedback to fine-tune movement.
Answer: True
Bloom’s Level: Understand
Concept Tested: Cerebellar error correction loop
52
Justification: This comparison allows the cerebellum to coordinate movement and maintain
balance and posture.
Q61. Working memory, the temporary holding and manipulation of information, is a primary
function of the prefrontal cortex.
Answer: True
Bloom’s Level: Remember
Concept Tested: Working memory prefrontal function
Justification: The prefrontal cortex is responsible for executive functions, including working
memory.
Q62. Executive functions are lower-level autonomic processes managed by the brain stem to
maintain homeostasis.
Answer: False
Bloom’s Level: Understand
Concept Tested: Executive function goal direction
Justification: Executive functions are higher cognitive processes (e.g., planning, inhibition)
associated with the prefrontal cortex.
Q63. The case of Phineas Gage demonstrated that damage to the prefrontal cortex can alter
personality and goal-directed behavior.
Answer: True
Bloom’s Level: Evaluate
Concept Tested: Phineas Gage personality change
Justification: Gage's frontal lobe injury led to reported changes in personality, illustrating the
prefrontal cortex's role in behavior.
Q64. Multimodal integration areas of the cerebral cortex process information from only a single
sensory modality.
Answer: False
Bloom’s Level: Remember
Concept Tested: Multimodal integration association areas
53
Justification: These areas integrate information from multiple sensory modalities for higher
functions like learning and cognition.
Q65. The primary somatosensory cortex, where touch sensations are consciously perceived, is
located in the precentral gyrus.
Answer: False
Bloom’s Level: Remember
Concept Tested: Primary somatosensory postcentral gyrus
Justification: The primary somatosensory cortex is in the postcentral gyrus of the parietal lobe.
Q66. The primary motor cortex, which initiates voluntary movements, is located in the precentral
gyrus of the frontal lobe.
Answer: True
Bloom’s Level: Remember
Concept Tested: Primary motor precentral gyrus
Justification: The precentral gyrus contains the primary motor cortex, which sends signals to
execute movement.
Q67. The internal capsule is a white matter structure in the cerebrum where descending motor
fibers travel between the thalamus and basal nuclei.
Answer: True
Bloom’s Level: Remember
Concept Tested: Internal capsule motor fiber bundle
Justification: Corticospinal tract fibers pass through the internal capsule on their way from the
cortex to the brain stem.
Q68. The cervical enlargement of the spinal cord has a larger ventral horn to accommodate more
motor neurons for the lower limbs.
Answer: False
Bloom’s Level: Analyze
Concept Tested: Cervical enlargement hand control
Justification: The cervical enlargement serves the upper limbs; the lumbar enlargement serves
the lower limbs.
54
Q69. The lumbar enlargement of the spinal cord contains a greater number of motor neurons
controlling the muscles of the legs and feet.
Answer: True
Bloom’s Level: Remember
Concept Tested: Lumbar enlargement leg control
Justification: The lumbar enlargement corresponds to the innervation of the lower limbs.
Q70. At the neuromuscular junction, motor neurons release the neurotransmitter norepinephrine
to stimulate muscle contraction.
Answer: False
Bloom’s Level: Remember
Concept Tested: Neuromuscular junction acetylcholine
Justification: The neurotransmitter at the skeletal muscle neuromuscular junction is always
acetylcholine (ACh).
Q71. Muscles requiring very fine control, like extraocular muscles, have motor units with a
single muscle fiber per motor neuron.
Answer: True
Bloom’s Level: Apply
Concept Tested: Motor unit precision variation
Justification: A small motor unit (few fibers per neuron) allows for precise control, as seen in
eye muscles.
Q72. During the withdrawal reflex, an inhibitory interneuron excites the motor neuron to the
triceps brachii to extend the elbow.
Answer: False
Bloom’s Level: Analyze
Concept Tested: Inhibitory interneuron triceps relaxation
Justification: The interneuron inhibits the triceps motor neuron to allow unimpeded flexion
(withdrawal) by the biceps.
Q73. Reciprocal inhibition is a reflex mechanism that coordinates antagonistic muscles by
inhibiting one while exciting the other.
55
Answer: True
Bloom’s Level: Understand
Concept Tested: Reciprocal inhibition reflex mechanism
Justification: This mechanism ensures smooth movement by preventing antagonistic muscles
from contracting simultaneously.
Q74. Prosopagnosia, or face blindness, is typically associated with damage to the primary visual
cortex in the occipital lobe.
Answer: False
Bloom’s Level: Apply
Concept Tested: Prosopagnosia fusiform face area
Justification: Prosopagnosia is often linked to damage in the fusiform gyrus of the temporal
lobe, a visual association area for face recognition.
Q75. Intrinsically photosensitive retinal ganglion cells (ipRGCs) project to the suprachiasmatic
nucleus to entrain circadian rhythms to light.
Answer: True
Bloom’s Level: Remember
Concept Tested: Circadian light detection ipRGCs
Justification: These specialized RGCs respond to light intensity and project to the SCN to
regulate daily cycles.
56
QUIZ 15 THE AUTONOMIC NERVOUS SYSTEM
Fill-in-the-Blank Quiz
Fill-in-the-Blank Questions (Concepts 1-25)
Chapter 15 | The Autonomic Nervous System
Q1. The autonomic nervous system regulates involuntary effectors, including cardiac muscle,
smooth muscle, and ________ tissue.
Answer: glandular
Bloom’s Level: Remember
Concept Tested: Autonomic nervous system definition
Explanation: The chapter defines the ANS as controlling cardiac and smooth muscle, as well as
glandular tissue, distinguishing it from the somatic nervous system.
Q2. The principle of ________ refers to the innervation of most target effectors by both
sympathetic and parasympathetic divisions.
Answer: dual innervation
Bloom’s Level: Understand
Concept Tested: Dual innervation principle
Explanation: Dual innervation allows competing inputs from both autonomic divisions to
determine the activity of an organ, such as the heart.
Q3. Sympathetic preganglionic neurons originate from the lateral horn of the spinal cord in the
thoracic and upper lumbar regions, a pattern known as the ________ outflow.
Answer: thoracolumbar
Bloom’s Level: Remember
Concept Tested: Thoracolumbar outflow origin
Explanation: The sympathetic division is anatomically defined by its central neurons located in
the thoracolumbar spinal cord.
Q4. In contrast to the sympathetic division, parasympathetic preganglionic neurons originate
from brain stem nuclei and the sacral spinal cord, forming the ________ outflow.
57
Answer: craniosacral
Bloom’s Level: Remember
Concept Tested: Craniosacral outflow origin
Explanation: The parasympathetic division is named for the location of its central neurons in
cranial nerve nuclei and the sacral spinal cord.
Q5. The axon from a central sympathetic neuron that projects to and synapses in a ganglion is
specifically called a ________ fiber.
Answer: preganglionic
Bloom’s Level: Remember
Concept Tested: Preganglionic sympathetic neuron
Explanation: The chapter defines the preganglionic fiber as the output from the CNS to the
autonomic ganglion.
Q6. The long axon from a ganglionic sympathetic neuron that projects to and influences a target
organ is the ________ fiber.
Answer: postganglionic
Bloom’s Level: Remember
Concept Tested: Postganglionic sympathetic neuron
Explanation: Postganglionic fibers represent the output of the ganglion that directly innervates
the effector organ.
Q7. Preganglionic parasympathetic fibers are typically ________ than their postganglionic
counterparts because the ganglia are close to the target organ.
Answer: longer
Bloom’s Level: Understand
Concept Tested: Preganglionic parasympathetic neuron
Explanation: In the parasympathetic system, ganglia are terminal and located near the effector,
resulting in long preganglionic and short postganglionic fibers.
Q8. The series of interconnected ganglia adjacent to the vertebral column that receive input from
sympathetic preganglionic fibers are the sympathetic ________ ganglia.
Answer: chain
58
Bloom’s Level: Remember
Concept Tested: Sympathetic chain ganglia anatomy
Explanation: The sympathetic chain ganglia form a network alongside the vertebral column
where many preganglionic fibers synapse.
Q9. Ganglia located anterior to the vertebral column, such as the celiac ganglion, are also known
as ________ ganglia.
Answer: prevertebral (or collateral)
Bloom’s Level: Remember
Concept Tested: Prevertebral ganglia function
Explanation: Collateral ganglia are situated anterior to the vertebral column and receive input
via splanchnic nerves to control abdominal organs.
Q10. The ________ ganglion is a prevertebral ganglion that provides sympathetic input to
digestive organs in the upper abdomen.
Answer: celiac
Bloom’s Level: Remember
Concept Tested: Celiac ganglion abdominal control
Explanation: The celiac ganglion is one of three major collateral ganglia associated with
sympathetic control of abdominal viscera.
Q11. The sympathetic nerve that contains fibers from T5-T9 that pass through the chain to
synapse in a prevertebral ganglion is the ________ nerve.
Answer: greater splanchnic
Bloom’s Level: Remember
Concept Tested: Greater splanchnic nerve pathway
Explanation: The greater splanchnic nerve projects to the celiac ganglion, carrying
preganglionic fibers that do not synapse in the chain ganglia.
Q12. Myelinated preganglionic sympathetic fibers enter the sympathetic chain via structures
called ________.
Answer: white rami communicantes
Bloom’s Level: Remember
59
Concept Tested: White rami communicantes myelinated
Explanation: White rami communicantes are the myelinated connections carrying preganglionic
fibers from the spinal nerve to the sympathetic chain.
Q13. Unmyelinated postganglionic sympathetic fibers re-join the spinal nerve to reach their
target via ________.
Answer: gray rami communicantes
Bloom’s Level: Remember
Concept Tested: Gray rami communicantes unmyelinated
Explanation: Gray rami communicantes are unmyelinated structures that connect the
sympathetic chain ganglia to the spinal nerve for distribution.
Q14. Specialized cells in the adrenal medulla that are stimulated by sympathetic preganglionic
fibers and release epinephrine into the bloodstream are ________ cells.
Answer: chromaffin
Bloom’s Level: Remember
Concept Tested: Chromaffin cell epinephrine release
Explanation: Chromaffin cells are neurosecretory cells in the adrenal medulla that function like
postganglionic neurons, releasing hormones.
Q15. Parasympathetic ganglia located very near to or within the walls of their target organs are
called ________ ganglia.
Answer: terminal (or intramural)
Bloom’s Level: Remember
Concept Tested: Terminal ganglia near effectors
Explanation: Terminal ganglia are the site of synapse for parasympathetic preganglionic fibers
and are located close to the effector.
Q16. The ________ nucleus in the midbrain contains parasympathetic preganglionic neurons
that project via the oculomotor nerve to control pupillary constriction.
Answer: Eddinger–Westphal
Bloom’s Level: Remember
Concept Tested: Eddinger–Westphal nucleus function
60
Explanation: The Eddinger-Westphal nucleus is the origin of parasympathetic fibers in cranial
nerve III that regulate the iris and ciliary muscle.
Q17. The ________ nucleus of the vagus nerve contains parasympathetic neurons that project to
terminal ganglia influencing thoracic and abdominal organs.
Answer: dorsal
Bloom’s Level: Remember
Concept Tested: Dorsal nucleus vagus output
Explanation: The dorsal motor nucleus of the vagus nerve is a major source of parasympathetic
output to the heart, lungs, and digestive tract.
Q18. Preganglionic sympathetic fibers that specifically increase heart rate are known as
________ nerves.
Answer: cardiac accelerator
Bloom’s Level: Remember
Concept Tested: Cardiac accelerator nerves identity
Explanation: Cardiac accelerator nerves are sympathetic fibers that project to the heart to
increase heart rate.
Q19. The classic physiological state of heightened alertness and energy mobilization is the
________ response.
Answer: fight-or-flight
Bloom’s Level: Remember
Concept Tested: Fight-or-flight physiological state
Explanation: The sympathetic division is associated with the fight-or-flight response, preparing
the body for intense activity.
Q20. Instead of typical synaptic end bulbs, autonomic postganglionic fibers often release
neurotransmitters from swellings along their length called ________.
Answer: varicosities
Bloom’s Level: Remember
Concept Tested: Autonomic varicosity structure
61
Explanation: Varicosities are chains of swellings along autonomic fibers that form extensive
networks for neurotransmitter release onto effectors.
Q21. A synapse where the neurotransmitter acetylcholine (ACh) is released is classified as a
________ synapse.
Answer: cholinergic
Bloom’s Level: Remember
Concept Tested: Cholinergic synapse definition
Explanation: Cholinergic synapses are defined by the release of acetylcholine, which occurs at
all autonomic ganglia and parasympathetic neuroeffector junctions.
Q22. The ________ receptor is a ligand-gated ion channel that is activated by ACh at all
autonomic ganglia.
Answer: nicotinic
Bloom’s Level: Remember
Concept Tested: Nicotinic receptor ionotropic type
Explanation: Nicotinic receptors are ionotropic channels found on all ganglionic neurons,
causing depolarization when ACh binds.
Q23. In contrast, the ________ receptor is a G protein-coupled receptor type that is activated by
ACh at parasympathetic target effectors.
Answer: muscarinic
Bloom’s Level: Understand
Concept Tested: Muscarinic receptor metabotropic type
Explanation: Muscarinic receptors are metabotropic receptors on target organs of the
parasympathetic division and some sympathetic targets like sweat glands.
Q24. The adrenergic receptor subtype primarily responsible for increasing heart rate and
contractility is the ________ receptor.
Answer: beta-1 (β1)
Bloom’s Level: Remember
Concept Tested: Beta-1 adrenergic cardioacceleration
62
Explanation: Beta-1 adrenergic receptors in the heart mediate the sympathetic effects of
increased rate and force of contraction.
Q25. A drug like phenylephrine, which binds to and activates adrenergic receptors to mimic
sympathetic effects, is classified as a ________ drug.
Answer: sympathomimetic
Bloom’s Level: Apply
Concept Tested: Sympathomimetic drug mechanism
Explanation: Sympathomimetic drugs enhance adrenergic function, either by binding to
receptors or increasing norepinephrine release.
Short Answer Questions
Q26. What brain stem nucleus contributes parasympathetic fibers to the vagus nerve for
controlling the heart and larynx?
Answer: The nucleus ambiguus.
Bloom’s Level: Remember
Concept Tested: Nucleus ambiguus vagal contribution
Explanation: The nucleus ambiguus provides parasympathetic output via the vagus nerve to
influence heart rate and muscles for swallowing.
Q27. Which brain stem nuclei contain neurons that control salivary gland secretion via the facial
and glossopharyngeal nerves?
Answer: The salivatory nuclei.
Bloom’s Level: Remember
Concept Tested: Salivatory nuclei facial control
Explanation: Salivatory nuclei in the medulla project parasympathetic fibers to ganglia that
activate salivary glands.
Q28. What is the collective term for preganglionic sympathetic fibers that regulate blood vessel
diameter?
Answer: Vasomotor nerves.
Bloom’s Level: Remember
63
Concept Tested: Vasomotor nerves constriction role
Explanation: Vasomotor nerves are sympathetic fibers that cause constriction of blood vessels,
maintaining vascular tone.
Q29. What physiological state is characterized by decreased heart rate and active digestion?
Answer: The rest-and-digest state.
Bloom’s Level: Understand
Concept Tested: Rest-and-digest physiological state
Explanation: The parasympathetic division promotes restorative functions like digestion while
lowering cardiac output.
Q30. What term describes the connection between an autonomic postganglionic fiber and its
target effector?
Answer: A neuroeffector junction.
Bloom’s Level: Remember
Concept Tested: Neuroeffector junction morphology
Explanation: This term distinguishes autonomic connections from typical synapses, often
involving varicosities.
Q31. What type of synapse is defined by the release of norepinephrine?
Answer: An adrenergic synapse.
Bloom’s Level: Remember
Concept Tested: Adrenergic synapse definition
Explanation: Adrenergic synapses involve norepinephrine binding to alpha or beta receptors on
target cells.
Q32. How many main subtypes of alpha-adrenergic receptors are described?
Answer: Three (α1, α2, α3).
Bloom’s Level: Remember
Concept Tested: Alpha-adrenergic receptor subtypes
Explanation: The chapter identifies three types of alpha-adrenergic receptors, all G protein-
coupled.
64
Q33. How many main subtypes of beta-adrenergic receptors are described?
Answer: Two (β1, β2).
Bloom’s Level: Remember
Concept Tested: Beta-adrenergic receptor subtypes
Explanation: The chapter identifies two primary types of beta-adrenergic receptors.
Q34. Which adrenergic receptor subtype primarily mediates constriction of blood vessels?
Answer: Alpha-1 (α1) adrenergic receptors.
Bloom’s Level: Understand
Concept Tested: Alpha-1 adrenergic vasoconstriction
Explanation: Activation of alpha-1 receptors on vascular smooth muscle leads to
vasoconstriction.
Q35. Which adrenergic receptor subtype primarily causes relaxation of bronchial smooth
muscle?
Answer: Beta-2 (β2) adrenergic receptors.
Bloom’s Level: Understand
Concept Tested: Beta-2 adrenergic bronchodilation
Explanation: Sympathetic stimulation of beta-2 receptors in the lungs results in bronchodilation.
Q36. What is the source of acetylcholine that acts as a neurotransmitter in the body?
Answer: It is an endogenous chemical released by cholinergic neurons.
Bloom’s Level: Remember
Concept Tested: Endogenous acetylcholine source
Explanation: Acetylcholine is produced and released within the body by neurons, distinguishing
it from exogenous drugs.
Q37. What is the mechanism of a sympatholytic drug?
Answer: It interrupts or blocks adrenergic function.
Bloom’s Level: Understand
Concept Tested: Sympatholytic drug mechanism
Explanation: Sympatholytic drugs, like beta-blockers, antagonize adrenergic receptors or reduce
norepinephrine signaling.
65
Q38. What is the primary action of a parasympathomimetic drug?
Answer: It enhances or mimics parasympathetic (cholinergic) function.
Bloom’s Level: Understand
Concept Tested: Parasympathomimetic drug action
Explanation: These drugs, like pilocarpine, act as muscarinic agonists to produce "rest-and-
digest" effects.
Q39. What class of drugs blocks the effects of acetylcholine at muscarinic receptors?
Answer: Anticholinergic drugs.
Bloom’s Level: Remember
Concept Tested: Anticholinergic drug blockade
Explanation: Anticholinergics, like atropine, inhibit parasympathetic activity by blocking
muscarinic receptors.
Q40. What type of adrenergic receptor does phenylephrine primarily agonize?
Answer: Alpha-1 (α1) adrenergic receptors.
Bloom’s Level: Apply
Concept Tested: Phenylephrine alpha-1 agonist
Explanation: Phenylephrine is a specific α1 agonist used as a decongestant and mydriatic.
Q41. What sympathomimetic decongestant has been restricted due to its use in illicit drug
production?
Answer: Pseudoephedrine.
Bloom’s Level: Remember
Concept Tested: Pseudoephedrine decongestant use
Explanation: Pseudoephedrine was commonly used in decongestants but is now regulated as a
precursor for amphetamines.
Q42. What is an example of a non-selective beta-adrenergic blocker (beta-blocker)?
Answer: Propranolol.
Bloom’s Level: Remember
Concept Tested: Propranolol nonselective beta-blocker
66
Explanation: Propranolol blocks both β1 and β2 adrenergic receptors, used for hypertension and
anxiety.
Q43. What is an example of a beta-1 selective adrenergic blocker?
Answer: Metoprolol.
Bloom’s Level: Remember
Concept Tested: Metoprolol beta-1 selective blocker
Explanation: Metoprolol preferentially blocks β1 receptors in the heart, used to treat
cardiovascular conditions.
Q44. What effect does the drug clonidine, an alpha-2 agonist, have on sympathetic outflow?
Answer: It decreases sympathetic outflow (is sympatholytic).
Bloom’s Level: Apply
Concept Tested: Clonidine alpha-2 agonist effect
Explanation: Clonidine acts centrally to reduce norepinephrine release, lowering blood pressure
and having anti-anxiety effects.
Q45. For what ophthalmic condition is the muscarinic agonist pilocarpine commonly used?
Answer: Glaucoma.
Bloom’s Level: Apply
Concept Tested: Pilocarpine muscarinic agonist use
Explanation: Pilocarpine constricts the pupil and increases aqueous humor drainage to reduce
intraocular pressure in glaucoma.
Q46. From which plant is the muscarinic antagonist atropine derived?
Answer: The belladonna plant (Atropa belladonna).
Bloom’s Level: Remember
Concept Tested: Atropine muscarinic antagonist source
Explanation: Atropine is a natural alkaloid extracted from the deadly nightshade plant.
Q47. What drug, delivered via a transdermal patch, is used to prevent motion sickness?
Answer: Scopolamine.
Bloom’s Level: Remember
67
Concept Tested: Scopolamine motion sickness patch
Explanation: Scopolamine blocks muscarinic receptors in the vestibular pathways to reduce
nausea and vomiting.
Q48. What is the common name for the Atropa plant that produces anticholinergic toxins?
Answer: Belladonna or deadly nightshade.
Bloom’s Level: Remember
Concept Tested: Belladonna plant anticholinergic toxin
Explanation: The belladonna plant contains atropine and scopolamine, which block muscarinic
receptors.
Q49. What is the term for excessive, pathological dilation of the pupil?
Answer: Mydriasis.
Bloom’s Level: Remember
Concept Tested: Mydriasis pharmacologic induction
Explanation: Mydriasis can be caused by sympathetic activation or anticholinergic drugs like
atropine.
Q50. What is the term for normal pupillary constriction?
Answer: Miosis.
Bloom’s Level: Remember
Concept Tested: Miosis pupillary constriction term
Explanation: Miosis is the constriction of the pupil, typically caused by parasympathetic
activation.
Fill-in-the-Blank Questions
Q51. The fundamental pathway for an automatic, unconscious organ response involves a sensory
neuron, an integrating center, and a two-neuron motor chain, collectively termed a ________.
Answer: visceral reflex arc
Bloom’s Level: Remember
Concept Tested: Visceral reflex arc structure
68
Explanation: This arc is the basic wiring for autonomic responses, distinct from somatic
reflexes due to its two-neuron efferent pathway.
Q52. Unlike a visceral reflex, the efferent branch of a ________ reflex involves a single lower
motor neuron projecting directly from the CNS to skeletal muscle.
Answer: somatic
Bloom’s Level: Analyze
Concept Tested: Somatic reflex arc contrast
Explanation: This highlights the key anatomical difference: somatic reflexes control voluntary
muscles via a direct connection, bypassing peripheral ganglia.
Q53. A reflex that is processed entirely within the peripheral nervous system, such as in the gut
wall, and does not involve the spinal cord or brain is called a ________ reflex.
Answer: short
Bloom’s Level: Remember
Concept Tested: Short reflex peripheral only
Explanation: Short reflexes allow for rapid, local organ regulation without the delay of central
nervous system processing.
Q54. In contrast, any reflex that requires processing by the spinal cord or brain stem to integrate
sensory information is classified as a ________ reflex.
Answer: long
Bloom’s Level: Remember
Concept Tested: Long reflex CNS involved
Explanation: Long reflexes involve central integration, allowing for coordinated, body-wide
autonomic adjustments to sensory input.
Q55. The extensive network of neurons within the walls of the gastrointestinal tract that can
operate independently is known as the ________ nervous system.
Answer: enteric
Bloom’s Level: Remember
Concept Tested: Enteric nervous system autonomy
69
Explanation: Often called the "second brain," this system independently manages complex
digestive functions like motility and secretion.
Q56. Within the enteric nervous system, the ________ plexus is primarily responsible for
controlling the rhythmic contractions of gastrointestinal smooth muscle.
Answer: myenteric
Bloom’s Level: Remember
Concept Tested: Myenteric plexus motility control
Explanation: Located between muscle layers, this plexus coordinates peristalsis and other
movements that propel digesting food.
Q57. The type of sensory receptor that detects stretch within blood vessel walls to monitor
pressure is a ________.
Answer: baroreceptor
Bloom’s Level: Remember
Concept Tested: Baroreceptor afferent glossopharyngeal
Explanation: These specialized mechanoreceptors are crucial for homeostatic cardiovascular
reflexes that regulate blood pressure.
Q58. Baroreceptors located in the ________ sinus send afferent signals about blood pressure to
the brain via the glossopharyngeal nerve (CN IX).
Answer: carotid
Bloom’s Level: Remember
Concept Tested: Carotid sinus pressure sensing
Explanation: This specific location is critical for monitoring blood pressure to the brain and
triggering corrective autonomic responses.
Q59. Afferent signals from baroreceptors in the ________ arch are transmitted to the central
nervous system via the vagus nerve (CN X).
Answer: aortic
Bloom’s Level: Remember
Concept Tested: Aortic arch baroreceptor input
70
Explanation: This pathway provides the medulla with essential information about systemic
arterial pressure.
Q60. The phenomenon where pain originating from the heart is perceived in the left shoulder and
arm is a classic example of ________ pain.
Answer: referred
Bloom’s Level: Understand
Concept Tested: Referred pain cardiac pattern
Explanation: This occurs because visceral and somatic sensory fibers converge on the same
spinal cord neurons, confusing the brain.
Q61. The clinical presentation of left shoulder pain following an injury to the spleen is known as
________ sign.
Answer: Kehr's
Bloom’s Level: Remember
Concept Tested: Kehr’s sign splenic rupture
Explanation: This referred pain results from blood irritating the diaphragm, which shares
sensory pathways with the shoulder.
Q62. Pain from the diaphragm is often referred to the shoulder because both areas send sensory
fibers into the spinal cord via the ________ nerve.
Answer: phrenic
Bloom’s Level: Analyze
Concept Tested: Diaphragmatic referred shoulder pain
Explanation: The phrenic nerve (C3-C5) carries sensation from the diaphragm, and the brain
misinterprets this signal as coming from the shoulder skin.
Q63. The motor nerve essential for breathing, which originates from cervical spinal nerves C3
through C5, is the ________ nerve.
Answer: phrenic
Bloom’s Level: Remember
Concept Tested: Phrenic nerve cervical origin
71
Explanation: This specific cervical origin is why neck injuries can impair breathing; the
diaphragm's motor control comes from these high spinal levels.
Q64. The baseline level of autonomic activity that sets the resting function of an organ is known
as autonomic ________.
Answer: tone
Bloom’s Level: Remember
Concept Tested: Autonomic tone resting bias
Explanation: This continuous, subtle input from one division (like parasympathetic slowing of
the heart) determines an organ's default state.
Q65. At rest, the heart rate is predominantly set by ________ tone, which slows the heart from
its intrinsic pacemaker rate.
Answer: parasympathetic
Bloom’s Level: Understand
Concept Tested: Parasympathetic heart rate dominance
Explanation: Vagal tone actively inhibits the sinoatrial node, establishing the normal, resting
heart rate of 60-80 beats per minute.
Q66. The resting diameter of most systemic blood vessels is maintained by a constant, low level
of ________ activity, creating vascular tone.
Answer: sympathetic
Bloom’s Level: Understand
Concept Tested: Sympathetic vascular tone default
Explanation: Most arteries and arterioles lack parasympathetic input, so their partial constriction
is solely due to sympathetic adrenergic signals.
Q67. A notable exception to sympathetic adrenergic signaling is the ________ glands, which are
activated by sympathetic cholinergic fibers.
Answer: sweat
Bloom’s Level: Remember
Concept Tested: Sweat gland cholinergic exception
72
Explanation: Here, postganglionic sympathetic fibers release acetylcholine (ACh) onto
muscarinic receptors to stimulate sweat production.
Q68. During the fight-or-flight response, sympathetic input causes vasodilation in the blood
vessels of ________ muscle to enhance blood flow.
Answer: skeletal
Bloom’s Level: Remember
Concept Tested: Skeletal muscle vasodilation exception
Explanation: This unique sympathetic cholinergic pathway prepares muscles for action by
increasing oxygen and nutrient delivery.
Q69. The dilation of blood vessels in genital erectile tissue, leading to erection, is primarily
under ________ control.
Answer: parasympathetic
Bloom’s Level: Remember
Concept Tested: Erectile tissue parasympathetic control
Explanation: Parasympathetic activity triggers the release of nitric oxide, causing smooth
muscle relaxation and vasodilation in this tissue.
Q70. Pupillary dilation (mydriasis) is caused by the contraction of ________ muscle fibers
within the iris.
Answer: radial
Bloom’s Level: Remember
Concept Tested: Radial iris muscle dilation
Explanation: These radially arranged smooth muscle cells contract when stimulated by
sympathetic nerves, widening the pupil.
Q71. Pupillary constriction (miosis) results from the contraction of ________ muscle fibers that
form a ring around the iris.
Answer: circular
Bloom’s Level: Remember
Concept Tested: Circular iris muscle constriction
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Explanation: These circular smooth muscle cells contract under parasympathetic control,
reducing the pupil's size to limit light entry.
Q72. The ________ muscle, when contracted, changes the shape of the lens to allow the eye to
focus on nearby objects.
Answer: ciliary
Bloom’s Level: Remember
Concept Tested: Ciliary muscle accommodation role
Explanation: This is part of the parasympathetic "near vision" response, which also includes
pupil constriction and lens accommodation.
Q73. Increased drainage of ________ humor, triggered by parasympathetic activation, is a key
mechanism for reducing intraocular pressure.
Answer: aqueous
Bloom’s Level: Remember
Concept Tested: Aqueous humor outflow regulation
Explanation: Parasympathomimetic drugs treat glaucoma by contracting the ciliary muscle,
which opens drainage canals for this fluid.
Q74. The eye disease characterized by increased intraocular pressure that can damage the optic
nerve is called ________.
Answer: glaucoma
Bloom’s Level: Apply
Concept Tested: Glaucoma intraocular pressure cause
Explanation: This condition is often managed with drugs that enhance parasympathetic outflow
to increase aqueous humor drainage.
Q75. A sudden drop in blood pressure upon standing, which may cause dizziness, is termed
________ hypotension.
Answer: orthostatic
Bloom’s Level: Remember
Concept Tested: Orthostatic hypotension definition
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Explanation: This occurs when the autonomic system fails to quickly adjust vascular tone and
heart rate in response to posture change.
Q76. The brief, benign dizziness experienced when standing up too quickly is sometimes
colloquially called a "________."
Answer: head rush
Bloom’s Level: Remember
Concept Tested: Benign head rush mechanism
Explanation: This is a mild, transient form of orthostatic hypotension due to a momentary lag in
the sympathetic vasomotor reflex.
Q77. Low blood volume, or ________, can prevent the sympathetic nervous system from
effectively compensating for postural changes.
Answer: hypovolemia
Bloom’s Level: Understand
Concept Tested: Hypovolemia autonomic failure cause
Explanation: Without adequate blood volume, even a perfectly functioning sympathetic reflex
cannot maintain sufficient blood pressure when upright.
Q78. Diabetic ________ neuropathy is a common complication where prolonged high blood
sugar damages autonomic nerve fibers.
Answer: autonomic
Bloom’s Level: Understand
Concept Tested: Diabetic autonomic neuropathy effect
Explanation: This can lead to a wide range of dysfunctions, including orthostatic hypotension,
gastroparesis, and erectile dysfunction.
Q79. The primary central integrator for heart rate and blood pressure reflexes is located in the
medulla and is called the ________ center.
Answer: cardiovascular
Bloom’s Level: Remember
Concept Tested: Medullary cardiovascular center role
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Explanation: This cluster of nuclei receives sensory input and sends output via cardiac
accelerator and vasomotor nerves.
Q80. The ________ nucleus in the medulla is a major relay station for visceral sensory
information arriving via cranial nerves VII, IX, and X.
Answer: solitary
Bloom’s Level: Remember
Concept Tested: Solitary nucleus visceral integration
Explanation: It integrates taste, cardiovascular, respiratory, and gastrointestinal signals before
relaying them to other brain regions.
Q81. The ________ fasciculus is a major descending pathway from the hypothalamus that
influences autonomic brain stem nuclei.
Answer: dorsal longitudinal
Bloom’s Level: Remember
Concept Tested: Dorsal longitudinal fasciculus pathway
Explanation: This tract allows the hypothalamus, a key homeostatic regulator, to control
parasympathetic and sympathetic output centers.
Q82. The ________ bundle is a major fiber tract connecting the hypothalamus with limbic
forebrain structures and descending autonomic centers.
Answer: medial forebrain
Bloom’s Level: Remember
Concept Tested: Medial forebrain bundle route
Explanation: This bidirectional pathway is crucial for linking emotional states from the limbic
system with autonomic responses from the hypothalamus.
Q83. The ________ system, including structures like the amygdala and hippocampus, is
responsible for linking emotions with autonomic responses.
Answer: limbic
Bloom’s Level: Remember
Concept Tested: Limbic-hypothalamic emotion link
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Explanation: Emotional processing in these forebrain areas directly influences the
hypothalamus, which then coordinates the physiological (autonomic) component of feelings.
Q84. Intense fear processed by the ________ triggers a powerful signal to the hypothalamus,
activating the full sympathetic fight-or-flight response.
Answer: amygdala
Bloom’s Level: Remember
Concept Tested: Amygdala fear-autonomic output
Explanation: This almond-shaped cluster of nuclei is the brain's central alarm system, capable
of activating the ANS even before conscious awareness.
Q85. While important for forming memories, the ________ has a less direct role in autonomic
control compared to the amygdala.
Answer: hippocampus
Bloom’s Level: Remember
Concept Tested: Hippocampus memory-autonomic indirect
Explanation: Its primary function is in learning and memory; it influences autonomic states
indirectly through connections to the hypothalamus and amygdala.
Q86. The ________ is a brain stem area that detects toxins in the blood and can trigger the
vomiting reflex.
Answer: area postrema
Bloom’s Level: Remember
Concept Tested: Area postrema emesis trigger
Explanation: Known as the chemoreceptor trigger zone, it lies outside the blood-brain barrier
and initiates protective emesis.
Q87. The area postrema can sample the blood directly because it lacks a complete ________.
Answer: blood-brain barrier
Bloom’s Level: Understand
Concept Tested: Blood–brain barrier circumvention
Explanation: This unique anatomical feature allows it to monitor blood chemistry and respond
quickly to circulating toxins.
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Q88. Motion sickness is primarily caused by a sensory conflict between the ________ system
and the visual system.
Answer: vestibular
Bloom’s Level: Understand
Concept Tested: Motion sickness vestibular conflict
Explanation: When the inner ear senses movement that the eyes do not see (or vice versa), it
triggers an autonomic stress response.
Q89. Nausea from motion sickness is mediated through ________ pathways that connect the
vestibular nuclei to the vomiting center.
Answer: vestibulo-autonomic
Bloom’s Level: Understand
Concept Tested: Vestibulo-autonomic nausea pathway
Explanation: This neural link explains why inner ear disturbances directly lead to autonomic
symptoms like pallor, sweating, and nausea.
Q90. The exogenous drug ________ acts as an agonist at nicotinic receptors, depolarizing all
autonomic ganglionic neurons.
Answer: nicotine
Bloom’s Level: Apply
Concept Tested: Exogenous nicotine agonist action
Explanation: By mimicking acetylcholine at ganglionic synapses, nicotine non-specifically
stimulates both sympathetic and parasympathetic outputs.
Q91. The plant-derived drug atropine functions as a competitive ________ at muscarinic
cholinergic receptors.
Answer: antagonist
Bloom’s Level: Apply
Concept Tested: Atropine muscarinic antagonist source
Explanation: Atropine blocks the action of acetylcholine at muscarinic receptors, inhibiting
parasympathetic effects and causing symptoms like dry mouth and tachycardia.
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Q92. The anticholinergic drug ________ is commonly used in over-the-counter medications to
prevent nausea and motion sickness.
Answer: dimenhydrinate
Bloom’s Level: Apply
Concept Tested: (Related to motion sickness treatment)
Explanation: It reduces vestibular-driven autonomic symptoms by blocking histamine and
muscarinic receptors in the brain stem pathways.
Q93. A major cardiovascular risk of smoking is ________-induced sympathetic overstimulation,
which can cause hypertension and arrhythmias.
Answer: nicotine
Bloom’s Level: Evaluate
Concept Tested: (Derived from chapter discussion on nicotine)
Explanation: Nicotine's ganglionic stimulation disrupts the balanced autonomic tone of the heart
and blood vessels, increasing strain on the cardiovascular system.
Q94. The endogenous neurotransmitter norepinephrine primarily exerts its effects by binding to
________ and ________ adrenergic receptors.
Answer: alpha, beta (α, β)
Bloom’s Level: Remember
Concept Tested: (Core concept of adrenergic signaling)
Explanation: This defines the two main classes of receptors that mediate the diverse
sympathetic effects on different target tissues.
Q95. The sympathetic division of the autonomic nervous system is also referred to as the
________ system due to the origin of its neurons.
Answer: thoracolumbar
Bloom’s Level: Remember
Concept Tested: Thoracolumbar system alternate name
Explanation: This name is derived from the anatomical location (lateral horn of thoracic and
upper lumbar spinal cord) of its central neurons.
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Q96. The string-of-beads appearance of autonomic postganglionic fibers, where
neurotransmitters are released, is due to structures called ________.
Answer: varicosities
Bloom’s Level: Remember
Concept Tested: Varicosity structure
Explanation: These swellings along the axon terminals allow for diffuse, non-synaptic release
of neurotransmitters over a wide area of the target tissue.
Q97. An automatic, unconscious response that adjusts the activity of an internal organ is
specifically called a ________ reflex.
Answer: visceral
Bloom’s Level: Remember
Concept Tested: Visceral reflex definition
Explanation: This term encompasses all autonomic reflexes that maintain homeostasis in
cardiac muscle, smooth muscle, and glands.
Q98. The myelinated structures that connect the spinal nerve to the sympathetic chain ganglion,
carrying preganglionic fibers, are the ________.
Answer: white rami communicantes
Bloom’s Level: Remember
Concept Tested: White rami communicantes myelinated
Explanation: These are the anatomical "entrance ramps" for preganglionic sympathetic axons
entering the paravertebral chain.
Q99. The overarching function of the autonomic nervous system is the involuntary maintenance
of ________.
Answer: homeostasis
Bloom’s Level: Understand
Concept Tested: Autonomic nervous system definition (core function)
Explanation: All autonomic activities—whether fight-or-flight or rest-and-digest—are
ultimately aimed at preserving the body's internal stability.
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Q100. The final common pathway for sympathetic signals to many abdominal organs is through
prevertebral ganglia, also known as ________ ganglia.
Answer: collateral
Bloom’s Level: Remember
Concept Tested: Prevertebral ganglia function
Explanation: These ganglia (celiac, superior mesenteric, inferior mesenteric) are anterior to the
spine and distribute sympathetic input to the gut and associated organs.
Multiple-Choice Questions
Q1. Which brainstem structure, when activated by toxins or visceral disturbances, initiates the
complex motor response of vomiting?
A. Nucleus ambiguus
B. Area postrema
C. Dorsal motor nucleus
D. Medial lemniscus
Bloom’s Level: Remember
Concept Tested: Emesis vomiting center activation
Correct Answer: Area postrema
Explanation: The area postrema is a chemoreceptor trigger zone in the medulla that activates the
vomiting reflex in response to various stimuli.
Q2. What is the primary advantage of administering scopolamine via a transdermal patch for
motion sickness?
A. It allows for direct CNS penetration via the skin.
B. It provides a slow, controlled release of the drug.
C. It bypasses first-pass metabolism in the stomach.
D. It prevents any systemic anticholinergic side effects.
Bloom’s Level: Apply
Concept Tested: Transdermal scopolamine delivery
Correct Answer: It provides a slow, controlled release of the drug.
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Explanation: The patch delivers a low, steady dose of the anticholinergic drug scopolamine to
prevent motion sickness symptoms over time.
Q3. Dimenhydrinate (Dramamine®) is effective against motion sickness primarily due to its
action as what type of agent?
A. Sympathomimetic
B. Antihistamine and antiemetic
C. Beta-adrenergic blocker
D. Cholinesterase inhibitor
Bloom’s Level: Apply
Concept Tested: Dimenhydrinate antihistamine antiemetic
Correct Answer: Antihistamine and antiemetic
Explanation: Dimenhydrinate reduces nausea and vomiting by blocking histamine and
muscarinic receptors in vestibular pathways.
Q4. What is the primary historical and regional reason for the same hormone having two names,
"adrenaline" and "epinephrine"?
A. Differences in chemical structure between continents.
B. One is a neurotransmitter, the other a hormone.
C. "Adrenalin" was once a proprietary drug name in the U.S.
D. Adrenaline is synthesized in the brain, epinephrine in the gland.
Bloom’s Level: Understand
Concept Tested: Adrenaline vs. epinephrine naming
Correct Answer: "Adrenalin" was once a proprietary drug name in the U.S.
Explanation: The naming difference persists from when "Adrenalin" was a registered
trademark, leading to the preference for "epinephrine" in U.S. scientific literature.
Q5. The neurotransmitter released from most sympathetic postganglionic fibers is known
interchangeably as:
A. Epinephrine and dopamine.
B. Norepinephrine and noradrenaline.
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C. Acetylcholine and epinephrine.
D. Serotonin and norepinephrine.
Bloom’s Level: Remember
Concept Tested: Noradrenaline vs. norepinephrine usage
Correct Answer: Norepinephrine and noradrenaline
Explanation: Norepinephrine (U.S.) and noradrenaline (U.K.) are two names for the same
endogenous catecholamine neurotransmitter.
Q6. The chemical distinction between norepinephrine and epinephrine is the addition of a single
________ group to the epinephrine molecule.
A. Amino
B. Carboxyl
C. Methyl
D. Hydroxyl
Bloom’s Level: Remember
Concept Tested: Methyl group epinephrine addition
Correct Answer: Methyl
Explanation: Epinephrine is synthesized from norepinephrine by the enzyme
phenylethanolamine N-methyltransferase, which adds a methyl group.
Q7. At all autonomic ganglia, the binding of acetylcholine to its receptor causes depolarization
because the receptor is a:
A. Muscarinic G protein-coupled receptor.
B. Beta-2 adrenergic receptor.
C. Nicotinic ligand-gated cation channel.
D. Alpha-1 adrenergic receptor.
Bloom’s Level: Remember
Concept Tested: Ganglionic nicotinic excitation
Correct Answer: Nicotinic ligand-gated cation channel
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Explanation: Nicotinic receptors at ganglia are ionotropic; ACh binding opens a channel for
Na+ and K+, directly exciting the ganglionic neuron.
Q8. In contrast to ganglionic receptors, acetylcholine binding at parasympathetic target effectors
activates ________ receptors that modulate cell activity via second messengers.
A. Nicotinic
B. Muscarinic
C. Adrenergic
D. Dopaminergic
Bloom’s Level: Understand
Concept Tested: Effector muscarinic modulation
Correct Answer: Muscarinic
Explanation: At target organs like the heart or gut, ACh binds to metabotropic muscarinic
receptors, which are G protein-coupled and cause indirect effects.
Q9. The primary mechanism by which norepinephrine alters the activity of target cells in organs
like the heart and blood vessels is by binding to:
A. Ionotropic nicotinic receptors.
B. Metabotropic muscarinic receptors.
C. Metabotropic adrenergic receptors.
D. Enzymatic acetylcholine receptors.
Bloom’s Level: Understand
Concept Tested: Effector adrenergic modulation
Correct Answer: Metabotropic adrenergic receptors
Explanation: Norepinephrine exerts its effects by binding to G protein-coupled alpha or beta
adrenergic receptors, initiating intracellular signaling cascades.
Q10. At organs with dual innervation, the final physiological state is determined by the
competition between two different:
A. Hormones released from the pituitary.
B. Neurotransmitters released from postganglionic fibers.
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C. Types of electrical impulses from the spinal cord.
D. Volitional signals from the cerebral cortex.
Bloom’s Level: Understand
Concept Tested: Dual neurotransmitter competition
Correct Answer: Neurotransmitters released from postganglionic fibers
Explanation: The balance between ACh (parasympathetic) and norepinephrine (sympathetic)
binding to their respective receptors dictates the organ's response.
Q11. Why is nicotine a significant risk factor for cardiac arrhythmias?
A. It directly destroys cardiac pacemaker cells.
B. It stimulates both sympathetic and parasympathetic inputs to the heart, creating conflicting
signals.
C. It blocks all adrenergic receptors in the myocardium.
D. It causes severe hypovolemia, reducing cardiac filling.
Bloom’s Level: Analyze
Concept Tested: Cardiac arrhythmia nicotine risk
Correct Answer: It stimulates both sympathetic and parasympathetic inputs to the heart,
creating conflicting signals.
Explanation: Nicotine's non-specific ganglionic stimulation sends opposing signals to the
intrinsically active heart muscle, disrupting its normal rhythm.
Q12. A primary mechanism by which smoking contributes to systemic hypertension is nicotine-
induced:
A. Parasympathetic vasodilation throughout the body.
B. Generalized sympathetic vasoconstriction.
C. Destruction of the vascular endothelium.
D. Inhibition of antidiuretic hormone release.
Bloom’s Level: Analyze
Concept Tested: Systemic hypertension nicotine effect
Correct Answer: Generalized sympathetic vasoconstriction
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Explanation: Nicotine stimulates sympathetic ganglia, leading to widespread release of
norepinephrine, which causes arteriolar constriction and increased peripheral resistance.
Q13. During an asthma attack, an inhaled drug that mimics the effect of the sympathetic nervous
system would aim to cause:
A. Bronchoconstriction via muscarinic receptors.
B. Bronchodilation via beta-2 adrenergic receptors.
C. Increased mucus secretion via cholinergic receptors.
D. Vasoconstriction in the bronchial arteries.
Bloom’s Level: Apply
Concept Tested: Bronchial smooth muscle relaxation
Correct Answer: Bronchodilation via beta-2 adrenergic receptors
Explanation: Sympathetic stimulation relaxes bronchial smooth muscle by activating beta-2
receptors, a mechanism used by rescue inhalers (e.g., albuterol).
Q14. Which autonomic division, and through which receptor, primarily causes contraction of the
detrusor muscle in the urinary bladder wall during micturition?
A. Sympathetic; alpha-1 adrenergic
B. Parasympathetic; muscarinic cholinergic
C. Sympathetic; beta-2 adrenergic
D. Parasympathetic; nicotinic cholinergic
Bloom’s Level: Apply
Concept Tested: Urinary bladder detrusor contraction
Correct Answer: Parasympathetic; muscarinic cholinergic
Explanation: Parasympathetic activity via pelvic splanchnic nerves releases ACh onto
muscarinic receptors, contracting the detrusor to expel urine.
Q15. To maintain urinary continence, sympathetic activity causes which of the following
actions?
A. Contraction of the detrusor muscle.
B. Relaxation of the internal urethral sphincter.
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C. Contraction of the internal urethral sphincter.
D. Inhibition of the micturition reflex in the sacral cord.
Bloom’s Level: Apply
Concept Tested: Internal urethral sphincter closure
Correct Answer: Contraction of the internal urethral sphincter
Explanation: Sympathetic nerves release norepinephrine onto alpha-1 receptors on the internal
urethral sphincter, causing it to contract and retain urine.
Q16. During a "fight-or-flight" response, sympathetic nervous system output to the digestive
tract would cause which of the following?
A. Increased motility and secretion in the stomach.
B. Dilation of gastrointestinal sphincters to speed up transit.
C. Constriction of gastrointestinal sphincters to inhibit movement.
D. Activation of the enteric nervous system's submucosal plexus.
Bloom’s Level: Apply
Concept Tested: GI sphincter sympathetic tightening
Correct Answer: Constriction of gastrointestinal sphincters to inhibit movement
Explanation: Sympathetic stimulation contracts sphincters (via alpha-1 receptors) to halt
digestion and shunt blood flow to more critical organs.
Q17. The vagus nerve (CN X) significantly increases gastrointestinal motility and secretory
activity by releasing which neurotransmitter onto intramural ganglia?
A. Norepinephrine
B. Epinephrine
C. Acetylcholine
D. Nitric oxide
Bloom’s Level: Remember
Concept Tested: GI motility parasympathetic increase
Correct Answer: Acetylcholine
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Explanation: Parasympathetic preganglionic fibers in the vagus nerve release ACh, exciting the
enteric nervous system to enhance digestive processes.
Q18. Emotional crying involves the activation of the lacrimal gland. Which cranial nerve carries
the parasympathetic fibers responsible for this tear production?
A. Oculomotor (CN III)
B. Trigeminal (CN V)
C. Facial (CN VII)
D. Glossopharyngeal (CN IX)
Bloom’s Level: Remember
Concept Tested: Lacrimal gland parasympathetic tear
Correct Answer: Facial (CN VII)
Explanation: The parasympathetic fibers for the lacrimal gland travel in the facial nerve (CN
VII), synapsing in the pterygopalatine ganglion.
Q19. Salivation in response to the smell of food primarily involves parasympathetic stimulation
of the submandibular and sublingual glands via fibers in which nerve?
A. Hypoglossal nerve (CN XII)
B. Vagus nerve (CN X)
C. Facial nerve (CN VII)
D. Trigeminal nerve (CN V)
Bloom’s Level: Remember
Concept Tested: Submandibular salivary stimulation
Correct Answer: Facial nerve (CN VII)
Explanation: Preganglionic parasympathetic fibers for the submandibular and sublingual glands
travel in the chorda tympani branch of the facial nerve.
Q20. The parotid gland, the largest salivary gland, is under parasympathetic control via
preganglionic fibers originating in the glossopharyngeal nerve (CN IX) and synapsing in which
ganglion?
A. Ciliary ganglion
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B. Pterygopalatine ganglion
C. Submandibular ganglion
D. Otic ganglion
Bloom’s Level: Remember
Concept Tested: Parotid gland glossopharyngeal control
Correct Answer: Otic ganglion
Explanation: Parasympathetic fibers for the parotid gland run in CN IX, synapse in the otic
ganglion, and then postganglionic fibers stimulate serous saliva production.
Q21. In conditions like chronic bronchitis, excessive parasympathetic (vagal) tone can worsen
symptoms by causing:
A. Bronchodilation and decreased airway resistance.
B. Bronchoconstriction and increased mucus secretion.
C. Vasodilation of pulmonary vessels.
D. Inhibition of the cough reflex.
Bloom’s Level: Apply
Concept Tested: Bronchoconstriction muscarinic response
Correct Answer: Bronchoconstriction and increased mucus secretion
Explanation: ACh from parasympathetic fibers binds to muscarinic receptors on airway smooth
muscle and glands, causing constriction and secretion.
Q22. A patient experiencing anaphylactic shock is given epinephrine. One of its critical life-
saving effects in this context is to cause rapid:
A. Bronchoconstriction to protect the alveoli.
B. Bronchodilation to improve airflow.
C. Decreased heart rate to conserve oxygen.
D. Vasodilation in the skin to release heat.
Bloom’s Level: Apply
Concept Tested: Bronchodilation adrenergic response
Correct Answer: Bronchodilation to improve airflow
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Explanation: Epinephrine's binding to beta-2 adrenergic receptors on bronchial smooth muscle
causes rapid relaxation, opening constricted airways.
Q23. When a penlight is shone into a person's eye, the observed constriction of that pupil is a
direct result of increased ________ activity.
A. Sympathetic
B. Parasympathetic
C. Somatic motor
D. Hypothalamic
Bloom’s Level: Remember
Concept Tested: Pupillary light reflex parasympathetic
Correct Answer: Parasympathetic
Explanation: The pupillary light reflex is mediated by parasympathetic fibers from the
Eddinger-Westphal nucleus traveling with the oculomotor nerve.
Q24. When walking into a dark movie theater, the dilation of your pupils that allows more light
to enter is primarily mediated by the ________ division of the ANS.
A. Somatic
B. Parasympathetic
C. Sympathetic
D. Enteric
Bloom’s Level: Understand
Concept Tested: Pupillary dark reflex sympathetic
Correct Answer: Sympathetic
Explanation: In low light, the sympathetic system stimulates the radial muscles of the iris via
fibers from the superior cervical ganglion, causing dilation (mydriasis).
Q25. The consensual pupillary light reflex describes the phenomenon where shining a light into
one eye causes:
A. Constriction of only the illuminated eye.
B. Dilation of both eyes.
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C. Constriction of both eyes.
D. Dilation of the illuminated eye and constriction of the other.
Bloom’s Level: Remember
Concept Tested: Consensual light reflex bilateral
Correct Answer: Constriction of both eyes
Explanation: Due to decussation of fibers in the pretectal area, the parasympathetic signal is
bilaterally distributed, causing constriction in both pupils even when only one is stimulated.
Q26. The pupillary light reflex, where light shined in one eye causes constriction in both, is an
example of which autonomic characteristic?
A. Divergent signaling
B. A unilateral response to a unilateral stimulus
C. A bilateral response to a unilateral stimulus
D. Tonic inhibitory control
Bloom’s Level: Understand
Concept Tested: Unilateral stimulus bilateral response
Correct Answer: A bilateral response to a unilateral stimulus
Explanation: Due to crossing of neural pathways in the brainstem, a stimulus to one retina
triggers a parasympathetic response in both eyes.
Q27. What is the primary functional advantage of the extensive divergence in the sympathetic
nervous system, where one preganglionic neuron synapses with many ganglionic neurons?
A. It allows for precise, localized control of individual organs.
B. It enables the coordinated, systemic activation needed for the fight-or-flight response.
C. It conserves metabolic energy by using fewer neuronal connections.
D. It prevents the overstimulation of any single target organ.
Bloom’s Level: Analyze
Concept Tested: Autonomic divergence amplification
Correct Answer: It enables the coordinated, systemic activation needed for the fight-or-flight
response.
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Explanation: Divergence allows a limited number of central sympathetic neurons to activate a
wide array of effectors simultaneously for a unified response.
Q28. Which of the following best describes the branching pattern of a single sympathetic
preganglionic neuron as it enters the sympathetic chain?
A. It synapses only at the chain ganglion at its level of entry.
B. It sends branches to synapse at multiple ganglia at different levels and to collateral ganglia.
C. It projects directly to the adrenal cortex without synapsing.
D. It sends a single, unbranched axon to one specific target organ.
Bloom’s Level: Remember
Concept Tested: Sympathetic preganglionic branching
Correct Answer: It sends branches to synapse at multiple ganglia at different levels and to
collateral ganglia.
Explanation: A single preganglionic sympathetic axon can diverge to influence several
ganglionic neurons, creating widespread effects.
Q29. In contrast to the sympathetic system, parasympathetic innervation is characterized by:
A. Extensive divergence and systemic effects.
B. Preganglionic fibers that are very short.
C. Ganglia located far from the target organs.
D. Limited divergence and localized, specific effects.
Bloom’s Level: Understand
Concept Tested: Parasympathetic localized innervation
Correct Answer: Limited divergence and localized, specific effects.
Explanation: Parasympathetic preganglionic fibers typically synapse with only a few ganglionic
neurons in terminal ganglia near one effector, allowing discrete control.
Q30. The vagus nerve (CN X) provides parasympathetic efferent innervation to which major
body regions?
A. Head and neck only
B. Thoracic and abdominal cavities
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C. Pelvic cavity and lower limbs
D. The entire body surface
Bloom’s Level: Remember
Concept Tested: Vagal efferent thoracic-abdominal reach
Correct Answer: Thoracic and abdominal cavities
Explanation: The vagus nerve is the primary parasympathetic pathway to the heart, lungs, and
most digestive organs down to the proximal large intestine.
Q31. Parasympathetic neurons originating in the sacral spinal cord (S2-S4) are primarily
responsible for controlling organs in the:
A. Thoracic cavity
B. Abdominal cavity
C. Pelvic cavity
D. Cranial cavity
Bloom’s Level: Remember
Concept Tested: Sacral parasympathetic pelvic control
Correct Answer: Pelvic cavity
Explanation: The sacral outflow forms the pelvic splanchnic nerves that innervate the distal
colon, bladder, and reproductive organs.
Q32. Which of the following nerves carries preganglionic parasympathetic fibers from the sacral
spinal cord to pelvic ganglia?
A. Vagus nerve
B. Pudendal nerve
C. Pelvic splanchnic nerve
D. Lesser splanchnic nerve
Bloom’s Level: Remember
Concept Tested: Pelvic splanchnic nerve identity
Correct Answer: Pelvic splanchnic nerve
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Explanation: These nerves are the parasympathetic component of the sacral outflow, distinct
from sympathetic splanchnic nerves.
Q33. Which brain region is considered the master controller for homeostasis, integrating
autonomic, endocrine, and behavioral responses?
A. Thalamus
B. Cerebellum
C. Hypothalamus
D. Hippocampus
Bloom’s Level: Remember
Concept Tested: Hypothalamic homeostatic integration
Correct Answer: Hypothalamus
Explanation: The hypothalamus receives diverse inputs and coordinates outputs to maintain the
body's internal balance through the ANS and pituitary gland.
Q34. The coordination of an autonomic response to an emotional stimulus, such as sweating
when scared, requires communication between the limbic system and the autonomic centers via
the:
A. Spinal cord tracts
B. Cerebral cortex
C. Hypothalamus
D. Medulla oblongata
Bloom’s Level: Understand
Concept Tested: Forebrain autonomic coordination
Correct Answer: Hypothalamus
Explanation: The hypothalamus acts as the principal link between higher brain regions involved
in emotion and the brainstem/spinal cord autonomic nuclei.
Q35. Which of the following is NOT a primary brainstem nucleus involved in direct autonomic
control?
A. Dorsal motor nucleus of the vagus
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B. Nucleus ambiguus
C. Eddinger-Westphal nucleus
D. Primary motor cortex
Bloom’s Level: Remember
Concept Tested: Brain stem autonomic nuclei
Correct Answer: Primary motor cortex
Explanation: The primary motor cortex is involved in voluntary somatic motor control, not
involuntary autonomic regulation.
Q36. The cell bodies of sympathetic preganglionic neurons are located in the lateral horn of the
gray matter in which spinal cord regions?
A. Cervical and sacral
B. Thoracic and lumbar
C. Thoracic only
D. Entire spinal cord length
Bloom’s Level: Remember
Concept Tested: Spinal autonomic lateral horn
Correct Answer: Thoracic and lumbar
Explanation: The lateral horn is present from T1 to L2/L3, housing the central neurons of the
sympathetic (thoracolumbar) division.
Q37. What is a dangerous autonomic condition that can occur after a spinal cord injury above
T6, characterized by a massive, unopposed sympathetic reflex?
A. Horner's syndrome
B. Autonomic dysreflexia
C. Orthostatic hypotension
D. Raynaud's phenomenon
Bloom’s Level: Apply
Concept Tested: Autonomic dysreflexia clinical risk
Correct Answer: Autonomic dysreflexia
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Explanation: This is a medical emergency where a noxious stimulus below the injury triggers
severe hypertension due to unchecked sympathetic outflow.
Q38. Damage to the sympathetic innervation of the face, often from a Pancoast tumor or cervical
trauma, results in a constellation of symptoms known as:
A. Bell's palsy
B. Horner's syndrome
C. Trigeminal neuralgia
D. Raynaud's disease
Bloom’s Level: Apply
Concept Tested: Horner’s syndrome sympathetic lesion
Correct Answer: Horner's syndrome
Explanation: This syndrome results from interruption of sympathetic fibers to the head,
affecting the pupil, eyelid, and facial sweating.
Q39. Which clinical sign of Horner's syndrome is characterized by a drooping of the upper
eyelid?
A. Miosis
B. Anhidrosis
C. Ptosis
D. Exophthalmos
Bloom’s Level: Remember
Concept Tested: Ptosis eyelid drooping sign
Correct Answer: Ptosis
Explanation: Ptosis occurs due to paralysis of the superior tarsal muscle, a smooth muscle
innervated by sympathetic fibers.
Q40. In Horner's syndrome, the loss of sweating on the affected side of the face is termed:
A. Mydriasis
B. Ptosis
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C. Anhidrosis
D. Flushing
Bloom’s Level: Remember
Concept Tested: Anhidrosis facial sweating loss
Correct Answer: Anhidrosis
Explanation: Sympathetic cholinergic fibers normally stimulate sweat glands; their damage
leads to a loss of sweating (anhidrosis).
Q41. A persistent constriction of the pupil that does not react normally to light or dark is a key
sign of Horner's syndrome and is called:
A. Mydriasis
B. Strabismus
C. Miosis
D. Nystagmus
Bloom’s Level: Remember
Concept Tested: Miosis persistent pupil constriction
Correct Answer: Miosis
Explanation: The unopposed action of the parasympathetic system on the iris sphincter causes a
persistently small pupil (miosis).
Q42. A tumor at the apex of the lung (Pancoast tumor) can cause Horner's syndrome by
compressing sympathetic fibers traveling through the:
A. Vagus nerve
B. Cervical plexus
C. Sympathetic trunk in the neck
D. Brachial plexus
Bloom’s Level: Apply
Concept Tested: Sympathetic trunk cervical injury
Correct Answer: Sympathetic trunk in the neck
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Explanation: The cervical sympathetic chain runs in close proximity to the lung apex and can be
damaged by an apical tumor.
Q43. Horner's syndrome can be a presenting sign of a tumor at the apex of the lung because the
tumor impinges on the:
A. Phrenic nerve
B. Recurrent laryngeal nerve
C. Cervical sympathetic ganglia/trunk
D. Thoracic duct
Bloom’s Level: Apply
Concept Tested: Apical lung tumor effect
Correct Answer: Cervical sympathetic ganglia/trunk
Explanation: The superior cervical ganglion and sympathetic chain are anatomically vulnerable
to compression by an apical lung mass.
Q44. The therapeutic action of any autonomic drug is fundamentally determined by its:
A. Color and formulation
B. Route of administration
C. Specificity for a particular receptor type
D. Speed of absorption from the gut
Bloom’s Level: Understand
Concept Tested: Autonomic drug receptor specificity
Correct Answer: Specificity for a particular receptor type
Explanation: Whether a drug mimics or blocks the endogenous neurotransmitter depends on its
precise binding to cholinergic or adrenergic receptors.
Q45. A drug that binds to a receptor and produces a similar effect to the body's own
neurotransmitter is classified as a(n):
A. Antagonist
B. Agonist
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C. Inhibitor
D. Blocker
Bloom’s Level: Remember
Concept Tested: Agonist mimics endogenous ligand
Correct Answer: Agonist
Explanation: An agonist activates the receptor, mimicking the natural ligand's action (e.g.,
phenylephrine at α1 receptors).
Q46. A drug that binds to a receptor site but does not activate it, preventing the natural
neurotransmitter from binding, is called a(n):
A. Agonist
B. Precursor
C. Antagonist
D. Catalyst
Bloom’s Level: Remember
Concept Tested: Antagonist blocks receptor site
Correct Answer: Antagonist
Explanation: An antagonist occupies the receptor without activating it, thereby blocking the
endogenous signal (e.g., atropine at muscarinic receptors).
Q47. Which type of receptor inhibition can be overcome by increasing the concentration of the
endogenous neurotransmitter?
A. Noncompetitive blockade
B. Chemical antagonism
C. Competitive inhibition
D. Irreversible inhibition
Bloom’s Level: Understand
Concept Tested: Competitive receptor inhibition
Correct Answer: Competitive inhibition
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Explanation: In competitive inhibition, the drug and neurotransmitter vie for the same binding
site, so high neurotransmitter levels can displace the drug.
Q48. A drug that binds to an allosteric site on a receptor, changing its shape and function
permanently, is performing:
A. Competitive inhibition
B. Noncompetitive receptor blockade
C. Reuptake inhibition
D. Enzymatic degradation
Bloom’s Level: Understand
Concept Tested: Noncompetitive receptor blockade
Correct Answer: Noncompetitive receptor blockade
Explanation: Noncompetitive antagonists bind to a different site, altering the receptor so it
cannot be activated, even by high neurotransmitter levels.
Q49. Muscarinic cholinergic and adrenergic receptors produce their effects inside the target cell
primarily by activating:
A. Ligand-gated ion channels
B. Voltage-gated sodium channels
C. G protein-coupled second messenger systems
D. Direct gene transcription factors
Bloom’s Level: Remember
Concept Tested: Second messenger G protein
Correct Answer: G protein-coupled second messenger systems
Explanation: These metabotropic receptors use G proteins to activate enzymes like adenylate
cyclase or phospholipase C, creating intracellular second messengers.
Q50. In contrast, the nicotinic acetylcholine receptor at autonomic ganglia works by being a:
A. G protein-coupled receptor
B. Second messenger activator
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C. Directly gated ion channel
D. Intracellular steroid receptor
Bloom’s Level: Remember
Concept Tested: Ion channel direct gating
Correct Answer: Directly gated ion channel
Explanation: The nicotinic receptor is an ionotropic receptor; ACh binding directly opens a
cation channel, causing rapid depolarization.
Q51. A class of drugs used to treat depression, such as SSRIs, works primarily by which
mechanism affecting autonomic neurotransmitters?
A. Blocking receptor sites
B. Inhibiting enzymatic synthesis
C. Preventing neurotransmitter reuptake
D. Destroying synaptic vesicles
Bloom’s Level: Apply
Concept Tested: Neurotransmitter reuptake inhibition
Correct Answer: Preventing neurotransmitter reuptake
Explanation: These drugs block transporter proteins, increasing synaptic neurotransmitter
concentration by slowing its removal from the cleft.
Q52. Pyridostigmine, a drug used in myasthenia gravis, enhances cholinergic signaling by which
primary mechanism?
A. Acting as a muscarinic agonist
B. Blocking nicotinic receptors
C. Inhibiting acetylcholinesterase enzymatic degradation
D. Stimulating norepinephrine release
Bloom’s Level: Apply
Concept Tested: Enzymatic degradation prevention
Correct Answer: Inhibiting acetylcholinesterase enzymatic degradation
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Explanation: It prevents the breakdown of acetylcholine by the enzyme acetylcholinesterase,
prolonging its action at the synapse.
Q53. Which enzyme is primarily responsible for the rapid termination of acetylcholine signal at
the neuromuscular junction and autonomic ganglia?
A. Monoamine oxidase (MAO)
B. Catechol-O-methyltransferase (COMT)
C. Acetylcholinesterase (AChE)
D. Dopamine beta-hydroxylase
Bloom’s Level: Remember
Concept Tested: Acetylcholinesterase synaptic clearance
Correct Answer: Acetylcholinesterase (AChE)
Explanation: Acetylcholinesterase hydrolyzes acetylcholine into choline and acetate, quickly
ending its postsynaptic effect.
Q54. Along with Monoamine Oxidase (MAO), which enzyme metabolizes catecholamines like
norepinephrine in the synaptic cleft and liver?
A. Acetylcholinesterase
B. Catechol-O-methyltransferase (COMT)
C. Trypsin
D. Lipase
Bloom’s Level: Remember
Concept Tested: Catechol-O-methyltransferase breakdown
Correct Answer: Catechol-O-methyltransferase (COMT)
Explanation: COMT adds a methyl group to catecholamines, contributing to their inactivation
in the synapse and systemic circulation.
Q55. A class of antidepressant drugs known as MAOIs works by inhibiting the action of
monoamine oxidase, thereby:
A. Blocking adrenergic receptors
B. Increasing the synaptic levels of serotonin and norepinephrine
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C. Preventing acetylcholine synthesis
D. Enhancing GABAergic inhibition
Bloom’s Level: Apply
Concept Tested: Monoamine oxidase metabolism
Correct Answer: Increasing the synaptic levels of serotonin and norepinephrine
Explanation: MAOIs block the intracellular breakdown of monoamine neurotransmitters in
presynaptic terminals, raising their available levels.
Q56. Unlike a typical sympathetic ganglion, the adrenal medulla releases its signaling molecules
directly into the bloodstream. This represents:
A. A synaptic failure
B. An endocrine hormonal amplification
C. A somatic motor pathway
D. A parasympathetic shortcut
Bloom’s Level: Understand
Concept Tested: Adrenal hormonal amplification
Correct Answer: An endocrine hormonal amplification
Explanation: The adrenal medulla functions as a modified sympathetic ganglion that secretes
epinephrine into circulation for widespread, potent effects.
Q57. During a severe stress response, the effects of sympathetic neuron activity are greatly
enhanced and prolonged by what complementary mechanism?
A. Release of local histamine
B. Circulating epinephrine from the adrenal medulla
C. Activation of the enteric nervous system
D. Parasympathetic vagal discharge
Bloom’s Level: Analyze
Concept Tested: Circulating epinephrine systemic effect
Correct Answer: Circulating epinephrine from the adrenal medulla
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Explanation: Epinephrine released as a hormone reinforces and extends the fight-or-flight
response to organs not directly innervated by sympathetic nerves.
Q58. The primary difference between the norepinephrine released from a postganglionic
sympathetic fiber and epinephrine from the adrenal medulla is its:
A. Chemical structure (methyl group)
B. Mode of delivery (synaptic vs. hormonal)
C. Target receptor specificity
D. Speed of enzymatic breakdown
Bloom’s Level: Analyze
Concept Tested: Local norepinephrine synaptic effect
Correct Answer: Mode of delivery (synaptic vs. hormonal)
Explanation: Norepinephrine acts as a local neurotransmitter at synapses, while epinephrine is a
blood-borne hormone with broader reach.
Q59. The long-term stress hormone that works synergistically with the sympathetic nervous
system to increase available energy is:
A. Insulin
B. Cortisol
C. Thyroxine
D. Estrogen
Bloom’s Level: Remember
Concept Tested: Stress-induced cortisol synergy
Correct Answer: Cortisol
Explanation: Cortisol, released from the adrenal cortex, supports sympathetic action by
promoting gluconeogenesis and suppressing non-essential functions.
Q60. Which neuroendocrine axis is activated during long-term stress, ultimately leading to the
release of cortisol?
A. Hypothalamic-pituitary-gonadal axis
B. Hypothalamic-pituitary-thyroid axis
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C. Hypothalamic-pituitary-adrenal axis
D. Renin-angiotensin-aldosterone axis
Bloom’s Level: Remember
Concept Tested: Hypothalamic-pituitary-adrenal axis
Correct Answer: Hypothalamic-pituitary-adrenal axis
Explanation: The HPA axis involves CRH from the hypothalamus, ACTH from the pituitary,
and cortisol from the adrenal cortex.
Q61. A person who experiences increased heart rate every time they visit a dentist due to a past
painful experience is demonstrating:
A. Somatic reflex conditioning
B. Emotional autonomic conditioning
C. Voluntary control override
D. Enteric nervous system memory
Bloom’s Level: Apply
Concept Tested: Emotional autonomic conditioning
Correct Answer: Emotional autonomic conditioning
Explanation: A previously neutral stimulus (dentist's office) becomes linked with an emotional
state that triggers a conditioned autonomic response.
Q62. The phenomenon where a specific sound or sight associated with a past trauma can trigger
an immediate fight-or-flight response illustrates:
A. A somatic spinal reflex
B. Learned fear visceral response
C. Voluntary muscle memory
D. Conscious cognitive appraisal
Bloom’s Level: Apply
Concept Tested: Learned fear visceral response
Correct Answer: Learned fear visceral response
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Explanation: Through associative learning, a neutral cue can evoke the same autonomic fear
response originally tied to a real threat.
Q63. Pavlov's dogs salivating at the sound of a bell is a classic example of:
A. Operant conditioning
B. Autonomic classical conditioning
C. Somatic motor learning
D. Cognitive behavioral therapy
Bloom’s Level: Understand
Concept Tested: Autonomic classical conditioning
Correct Answer: Autonomic classical conditioning
Explanation: An involuntary autonomic response (salivation) becomes elicited by a previously
neutral stimulus (bell) after repeated pairing with food.
Q64. A therapeutic technique where patients use visual feedback of their physiological state to
consciously lower their blood pressure is known as:
A. Pharmacotherapy
B. Neurosurgery
C. Biofeedback autonomic modulation
D. Cognitive restructuring
Bloom’s Level: Apply
Concept Tested: Biofeedback autonomic modulation
Correct Answer: Biofeedback autonomic modulation
Explanation: Biofeedback uses real-time displays of autonomic functions to train voluntary
control over normally involuntary processes.
Q65. A polygraph (lie detector) test primarily measures physiological indicators of:
A. Cognitive processing speed
B. Sympathetic nervous system arousal
C. Parasympathetic digestive activity
D. Somatic muscle tension only
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Bloom’s Level: Understand
Concept Tested: Polygraph sympathetic arousal basis
Correct Answer: Sympathetic nervous system arousal
Explanation: It monitors changes like heart rate, sweating, and blood pressure, which are
mediated by sympathetic activity during stress.
Q66. The "cold pressor test," where a hand is immersed in ice water, primarily evokes a strong:
A. Parasympathetic rest-and-digest response
B. Sympathetic fight-or-flight response
C. Enteric nervous system activation
D. Voluntary motor contraction
Bloom’s Level: Understand
Concept Tested: Cold pressor test response
Correct Answer: Sympathetic fight-or-flight response
Explanation: The noxious cold stimulus triggers a sympathetic reflex, increasing heart rate and
blood pressure.
Q67. The Valsalva maneuver (forceful exhalation against a closed airway) causes a characteristic
sequence of autonomic shifts primarily detected by:
A. Chemoreceptors
B. Baroreceptors
C. Photoreceptors
D. Nociceptors
Bloom’s Level: Apply
Concept Tested: Valsalva maneuver autonomic shift
Correct Answer: Baroreceptors
Explanation: The maneuver alters intrathoracic pressure and venous return, rapidly changing
blood pressure which is sensed by arterial baroreceptors.
Q68. When blood pressure rises suddenly, the body counteracts this via the baroreflex, a key
homeostatic mechanism that:
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A. Increases sympathetic outflow to raise pressure further
B. Buffers the change by increasing parasympathetic and decreasing sympathetic activity
C. Triggers vasodilation in the skin only
D. Inhibits all autonomic input to the heart
Bloom’s Level: Understand
Concept Tested: Baroreflex buffering mechanism
Correct Answer: Buffers the change by increasing parasympathetic and decreasing sympathetic
activity
Explanation: The baroreflex is a negative feedback loop that normalizes blood pressure by
adjusting heart rate and vascular resistance.
Q69. A drop in blood pH (acidosis) detected by peripheral chemoreceptors would trigger an
integrated autonomic response to:
A. Decrease heart rate and constrict airways
B. Increase ventilation and heart rate
C. Stimulate digestion and salivation
D. Promote urine production
Bloom’s Level: Apply
Concept Tested: Chemoreceptor respiratory-autonomic link
Correct Answer: Increase ventilation and heart rate
Explanation: Chemoreceptors stimulate respiratory centers to increase breathing and also
increase sympathetic outflow to boost cardiac output.
Q70. Peripheral chemoreceptors sensitive to low oxygen levels are primarily located in the:
A. Aortic arch and carotid bodies
B. Medulla oblongata
C. Pulmonary capillaries
D. Renal arteries
Bloom’s Level: Remember
Concept Tested: Carotid body oxygen sensing
108
Correct Answer: Aortic arch and carotid bodies
Explanation: The carotid and aortic bodies contain chemoreceptors that monitor arterial O2,
CO2, and pH, sending signals via CN IX and X.
Q71. Chemoreceptors in the aortic bodies are particularly sensitive to changes in:
A. Blood glucose levels
B. Blood pH and carbon dioxide levels
C. Plasma sodium concentration
D. Core body temperature
Bloom’s Level: Remember
Concept Tested: Aortic body pH detection
Correct Answer: Blood pH and carbon dioxide levels
Explanation: Along with oxygen, aortic body chemoreceptors detect increases in CO2 (which
lowers pH) and signal the medulla.
Q72. Central chemoreceptors, located in the medulla oblongata, are primarily stimulated by:
A. Low oxygen in arterial blood
B. High oxygen in cerebrospinal fluid (CSF)
C. Hydrogen ion concentration in the CSF
D. Nitric oxide levels in the brain
Bloom’s Level: Remember
Concept Tested: Central chemoreceptor medullary location
Correct Answer: Hydrogen ion concentration in the CSF
Explanation: They monitor the pH of cerebrospinal fluid, which reflects arterial CO2 levels, and
drive adjustments in ventilation.
Q73. While voluntary control can override it briefly, the automatic, resting rhythm of breathing
is set by the brainstem and modulated by the:
A. Somatic motor cortex
B. Autonomic nervous system
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C. Enteric nervous system
D. Limbic system only
Bloom’s Level: Understand
Concept Tested: Autonomic respiratory rate control
Correct Answer: Autonomic nervous system
Explanation: The autonomic system adjusts bronchial tone and breathing depth/rate in response
to metabolic and emotional demands.
Q74. The "cephalic phase" of digestion, where the sight or smell of food prepares the gut, is
mediated by the ________ nervous system increasing digestive enzyme secretion.
A. Somatic
B. Sympathetic
C. Parasympathetic
D. Enteric
Bloom’s Level: Apply
Concept Tested: Digestive enzyme parasympathetic boost
Correct Answer: Parasympathetic
Explanation: Parasympathetic vagal activity triggers the release of gastrin and other enzymes
from the stomach and pancreas in anticipation of food.
Q75. During heavy exercise or acute stress, sympathetic activation reduces blood flow to the
kidneys, which is an example of:
A. Renal sympathetic flow reduction
B. Parasympathetic vasodilation
C. Enteric nervous system override
D. Local metabolic autoregulation
Bloom’s Level: Apply
Concept Tested: Renal sympathetic flow reduction
Correct Answer: Renal sympathetic flow reduction
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Explanation: Sympathetic nerves cause vasoconstriction of renal arteries, diverting blood away
from the kidneys to skeletal muscle and heart.
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Reference
OpenStax. (2024). The nervous system and nervous tissue. In Anatomy & physiology (2nd ed.).
OpenStax. https://openstax.org/details/books/anatomy-and-physiology-2e
