Quiz 2
Liberty University
BIOM 525
Human Physiology Lecture
Question 1 2.5 out of 2.5 points
Which of the following actions is/are mediated by β2 receptors:
Selected Answer:
d. dilation of airways and relaxation of bladder wall
Correct Answer:
d. dilation of airways and relaxation of bladder wall
Question 2 2.5 out of 2.5 points
Which adrenergic receptor produces its stimulatory effects by the formation of
inositol 1,4,5-triphosphate (IP3) and an increase in intracellular [Ca2+]?
Selected Answer:
a. α1 Receptors
Correct Answer:
a. α1 Receptors
Question 3 2.5 out of 2.5 points
Which of the following responses is mediated by parasympathetic muscarinic
receptors?
Selected Answer:
b. Miosis
Correct Answer:
b. Miosis
Question 4 2.5 out of 2.5 points
Which of the following is/are characteristic(s) of the parasympathetic nervous
system, but not of the sympathetic nervous system:
Selected Answer:
a. ganglia in or near target tissues
Correct Answer:
a. ganglia in or near target tissues
Question 5 2.5 out of 2.5 points
A 48-year-old woman visits her physician complaining of what she calls “panic
attacks.” She reports that she has experienced a racing heart and that she can feel
(and even see) her heart pounding in her chest. She also complains of throbbing
headaches, cold hands and cold feet, feeling hot, visual disturbances, and nausea
and vomiting. In the physician's office, her blood pressure is severely elevated
(230/125). She is admitted to the hospital for evaluation of her hypertension. A 24-
hour urine sample reveals elevated levels of metanephrine, normetanephrine, and 3-
methoxy-4-hydroxymandelic acid (VMA). After the physician rules out other causes
for hypertension, he concludes that she has a tumor of the adrenal medulla,
called______?
Selected Answer:
B. Pheochromocytoma
Correct Answer:
B. Pheochromocytoma
Question 6 2.5 out of 2.5 points
Which of these drugs that acts on the sympathetic nervous system is correctly paired
to its mechanism of action?
Selected Answer:
d. Metoprolol – Beta 1 antagonist
Correct Answer:
d. Metoprolol – Beta 1 antagonist
Question 7 2.5 out of 2.5 points
Which of these is not true about the somatic motor nervous system?
Selected
Answer:
b. Each pathways consists of 2 neurons (preganglionic and
postganglionic)
Correct Answer:
b. Each pathways consists of 2 neurons (preganglionic and
postganglionic)
Question 8 2.5 out of 2.5 points
Which of the following actions are mediated by muscarinic receptors?
Selected Answers:
a. Slowing of conduction velocity in AV node
b. gastric acid secretion
e. erection
g. sweating on a hot day
Correct Answers:
a. Slowing of conduction velocity in AV node
b. gastric acid secretion
e. erection
g. sweating on a hot day
Question 9 2.5 out of 2.5 points
Which autonomic receptor is activated by low concentrations of epinephrine released
from the adrenal medulla and causes vasodilation?
Selected Answer:
c. Adrenergic β2 receptors
Correct Answer:
c. Adrenergic β2 receptors
Question 10 2.5 out of 2.5 points
Which of the following actions is/are mediated by the adenylyl cyclase mechanism:
Selected Answer:
c. effect of acetylcholine to decrease heart rate
Correct Answer:
c. effect of acetylcholine to decrease heart rate
Question 11 2.5 out of 2.5 points
The neurotransmitter most commonly utilized in preganglionic neuronal
communication by the sympathetic nervous system is ______?
Selected Answer:
c. Acetylcholine
Correct Answer:
c. Acetylcholine
Question 12 2.5 out of 2.5 points
Which of these cranial nerve nuclei is a component of the sympathetic nervous
system?
Selected Answer:
d. None of these
Correct Answer:
d. None of these
Question 13 2.5 out of 2.5 points
Which of these drugs blocks the ganglionic nicotinic receptor type 2 (N2) in the entire
autonomic nervous system?
Selected Answer:
c. Hexamethonium
Correct Answer:
c. Hexamethonium
Question 14 2.5 out of 2.5 points
Which autonomic receptor mediates secretion of epinephrine by the adrenal
medulla?
Selected Answer:
e. Cholinergic nicotinic receptors
Correct Answer:
e. Cholinergic nicotinic receptors
Question 15 2.5 out of 2.5 points
A woman who is taking atropine for a gastrointestinal disorder notices that her pupils
are dilated. This has occurred because atropine blocks ___________ receptors on
the __________muscle of the iris.
Selected Answer:
a. Muscarinic : Sphincter
Correct Answer:
a. Muscarinic : Sphincter
Question 16 2.5 out of 2.5 points
Which of the following is a feature of the sympathetic, but not the parasympathetic
nervous system?
Selected Answer:
e. Preganglionic neurons originate in the thoracolumbar spinal cord
Correct Answer:
e. Preganglionic neurons originate in the thoracolumbar spinal cord
Question 17 2.5 out of 2.5 points
The sympathetic postganglionic neurons release only norepinephrine while the
adrenal medulla secretes mainly epinephrine (80%) and a small amount of
norepinephrine (20%). The sympathetic postganglionic neurons do not secrete
epinephrine because;
Selected
Answer:
b. Phenylethanolamine-N-methyltransferase (PNMT) which converts
norepinephrine to epinephrine is present in the adrenal medulla, but not in
sympathetic postganglionic adrenergic neurons
Correct
Answer:
b. Phenylethanolamine-N-methyltransferase (PNMT) which converts
norepinephrine to epinephrine is present in the adrenal medulla, but not in
sympathetic postganglionic adrenergic neurons
Question 18 2.5 out of 2.5 points
A 42-year-old woman with elevated blood pressure, visual disturbances, and
vomiting has increased urinary excretion of 3-methoxy-4-hydroxymandelic acid
(VMA). A computerized tomographic scan shows an adrenal mass that is consistent
with a diagnosis of pheochromocytoma. While awaiting surgery to remove the tumor,
she is treated with phenoxybenzamine to lower her blood pressure. What is the
mechanism of this action of the drug?
Selected Answer:
d. Decreasing IP3/Ca2+ (E) Opening Na+/K+ channels
Correct Answer:
d. Decreasing IP3/Ca2+ (E) Opening Na+/K+ channels
Question 19 2.5 out of 2.5 points
Propranolol causes a decrease in heart rate because it _______________ the
_____________ receptors in the sinoatrial node of the heart.
Selected Answer:
a. Inhibits ; β1 receptors
Correct Answer:
a. Inhibits ; β1 receptors
Question 20 2.5 out of 2.5 points
Patients are enrolled in trials of a new atropine analogue. Which of the following
would be expected?
Selected Answer:
a. Increased AV node conduction velocity
Correct Answer:
a. Increased AV node conduction velocity
