BIOM 525 Liberty University Human Physiology Lecture Quiz 4 PRACTICE 2022.pdf

Quiz 4

Liberty University

BIOM 525

Human Physiology Lecture

 Question 1

1 out of 1 points

The term that best describes the lungs' ability to expand or stretch is ______

Selected Answer:

compliance.

Correct Answer:

compliance.

 Question 2

1 out of 1 points

The partial pressure of carbon dioxide in the cells of peripheral tissues is approximately ________ mm

Hg.

Selected Answer:

Correct Answer:

 Question 3

1 out of 1 points

The respiratory rate times the tidal volume corrected for dead space is the

Selected Answer:

alveolar ventilation rate.

Correct Answer:

alveolar ventilation rate.

 Question 4

1 out of 1 points

During normal expiration,

Selected Answer:

elastic recoil of stretched muscles helps return the thorax to its resting volume.

Correct Answer:

elastic recoil of stretched muscles helps return the thorax to its resting volume.

 Question 5

0 out of 1 points

Compared to the systemic circulation, pulmonary circulation involves

Selected Answer:

lower interstitial fluid colloid osmotic pressure

Correct Answer:

more negative interstitial fluid pressure

 Question 6

1 out of 1 points

Which of the following features of the alveolar sacs allows for the ease of diffusion of gasses?

Selected Answer:

They are made of a single layer of simple squamous epithelium.

Correct Answer:

They are made of a single layer of simple squamous epithelium.

 Question 7

1 out of 1 points

Which of the following characteristics makes hemoglobin's structure such a good match for its

function as an oxygen carrier?

Selected Answer:

Each hemoglobin molecule can bind four oxygen molecules.

Correct Answer:

Each hemoglobin molecule can bind four oxygen molecules.

 Question 8

1 out of 1 points

Boyle's law states that gas volume is

Selected Answer:

inversely proportional to pressure.

Correct Answer:

inversely proportional to pressure.

 Question 9

1 out of 1 points

Intrapleural pressure is _______

Selected Answer:

always negative compared to both the alveolar pressure and atmosphere.

Correct Answer:

always negative compared to both the alveolar pressure and atmosphere.

 Question 10

1 out of 1 points

The law that describes the factors that affect flow is best stated

Selected Answer:

R Lη/r4

Correct Answer:

R Lη/r4

 Question 11

1 out of 1 points

According to Boyle's law of gases, the pressure of a gas at constant temperature is

directly proportional to the volume of the gas in a chamber.

Selected Answer:

False

Correct Answer:

False

 Question 12

1 out of 1 points

In alveolar gaseous exchange, which of these gases is diffusion-limited?

Selected Answer:

Correct Answer:

 Question 13

1 out of 1 points

Hypoxemia produces hyperventilation by a direct effect on the;

Selected Answer:

carotid and aortic body chemoreceptors

Correct Answer:

carotid and aortic body chemoreceptors

 Question 14

1 out of 1 points

You are evaluating a patient with this lab result - arterial blood pH is 7.25, pCO2 is

24 mm Hg, and HCO3− is 10.2 mEq/L, an unlikely diagnosis of this patient will be;

Selected Answer:

COPD

Correct Answer:

COPD

 Question 15

1 out of 1 points

The exchange of chloride for bicarbonate ions across the red blood cell membrane is

accomplished by the anion exchanger called;

Selected Answer:

Band 3 protein

Correct Answer:

Band 3 protein

 Question 16

1 out of 1 points

Which of these is not included as an unmeasured anion in the anion gap estimation?

Selected Answer:

Chloride

Correct Answer:

Chloride

 Question 17

1 out of 1 points

The pK of the HPO4−2/H2PO4 − buffer pair is 6.8. At what pH would the

concentrations of the acid and base forms be equal?

Selected Answer:

6.8

Correct Answer:

6.8

 Question 18

1 out of 1 points

Which volume remains in the lungs after a tidal volume (Vt) is expired?

Selected Answer:

Functional residual capacity (FRC)

Correct Answer:

Functional residual capacity (FRC)

 Question 19

1 out of 1 points

The pH of venous blood is only slightly more acidic than the pH of arterial blood

because

Selected

Answer:

the H+ generated from CO2 and H2O is buffered by deoxyhemoglobin

in venous blood

Correct

Answer:

the H+ generated from CO2 and H2O is buffered by deoxyhemoglobin

in venous blood

 Question 20

1 out of 1 points

A 48-year-old woman at sea level breaths a gas mixture containing 21% O2. She has the following arterial

blood gas values: PaO2 = 60 mm Hg PaCO2 = 45 mm Hg Her measured DLCO is normal. Which of the

following is the cause of her hypoxemia?

Selected Answer:

Right-to-left shunt

Correct Answer:

Right-to-left shunt

 Question 21

1 out of 1 points

Hyperkalemia leads to decreased intracellular pH, inhibits NH3 synthesis and renal

tubular acidosis.

Selected Answer:

False

Correct Answer:

False

 Question 22

1 out of 1 points

An infant born prematurely in gestational week 25 has neonatal respiratory distress

syndrome. Which of the following would be expected in this infant?

Selected Answer:

Collapse of the small alveoli

Correct Answer:

Collapse of the small alveoli

 Question 23

1 out of 1 points

A healthy 65-year-old man with a tidal volume (Vt) of 0.45 L has a breathing

frequency of 16 breaths/min. His arterial Pco2 is 41 mm Hg, and the Pco2 of his

expired air is 35 mm Hg. What is his alveolar ventilation?

Selected Answer:

6.14 L/min

Correct Answer:

6.14 L/min

 Question 24

1 out of 1 points

Which of these commonly results from exposure to very high altitude?

Selected Answer:

All of these

Correct Answer:

All of these

 Question 25

1 out of 1 points

The pH of a patient whose pCO2 is 52mmHg and HCO3- is 30mmol/L is calculated

to be 7.38.

Selected Answer:

True

Correct Answer:

True

 Question 26

1 out of 1 points

A 42-year-old woman with severe pulmonary fibrosis is evaluated by her physician

and has the following arterial blood gases: pH = 7.48, PaO2 = 55 mm Hg, and

PaCO2 = 32 mm Hg. Which statement best explains the observed value of PaCO2?

Selected

Answer:

The decreased PaO2 stimulates breathing via peripheral

chemoreceptors

Correct Answer:

The decreased PaO2 stimulates breathing via peripheral

chemoreceptors

 Question 27

1 out of 1 points

A patient is seen in the emergency department with the following blood values: pH,

7.1; HCO3− = 10 mEq/L; Na+ = 142 mEq/L and Cl− 103 mEq/L. What is the

metabolic disorder?

Selected Answer:

Metabolic acidosis with increased anion gap

Correct Answer:

Metabolic acidosis with increased anion gap

 Question 28

1 out of 1 points

The epithelium of which part of the respiratory tree is not ciliated?

Selected Answer:

Alveolar sacs

Correct Answer:

Alveolar sacs

 Question 29

1 out of 1 points

The R-R interval is commonly increased during inspiration due to increased venous

return – a phenomenon called respiratory sinus arrhythmia.

Selected Answer:

False

Correct Answer:

False

 Question 30

1 out of 1 points

In a patient with pulmonary arteritis and loss of pulmonary capillaries, the suspected

ventilation to perfusion ratio will be decreased due to an increase in pulmonary dead

space.

Selected Answer:

False

Correct Answer:

False

 Question 31

1 out of 1 points

In the transport of CO2 from the tissues to the lungs, which of the following occurs in

venous blood?

Selected

Answer:

Conversion of CO2 and H2O to H+ and HCO3− in the red blood cells

(RBCs)

Correct

Answer:

Conversion of CO2 and H2O to H+ and HCO3− in the red blood cells

(RBCs)

 Question 32

1 out of 1 points

Which of the following is true during inspiration?

Selected Answer:

Intrapleural pressure is more negative than it is during expiration

Correct Answer:

Intrapleural pressure is more negative than it is during expiration

 Question 33

1 out of 1 points

Expiration is a passive process due to the elastic recoil of the lungs. A loss of elastic

recoil results in extremely compliant lungs.

Selected Answer:

True

Correct Answer:

True

 Question 34

1 out of 1 points

Which alveolar cell type is responsible for producing surfactant?

Selected Answer:

Type 2 pneumocytes

Correct Answer:

Type 2 pneumocytes

 Question 35

1 out of 1 points

Which is the best indicator of total H+ excreted in the urine?

Selected Answer:

Filtered load of HPO42-

Correct Answer:

Filtered load of HPO42-

 Question 36

1 out of 1 points

If an area of the lung is not ventilated because of bronchial obstruction, the

pulmonary capillary blood serving that area will have a Po2 that is;

Selected Answer:

equal to mixed venous Po2

Correct Answer:

equal to mixed venous Po2

 Question 37

1 out of 1 points

Carboxyhemoglobin makes the plasma have a cherry-red color

Selected Answer:

True

Correct Answer:

True

 Question 38

1 out of 1 points

A 35-year-old man has a vital capacity (VC) of 5 L, a tidal volume (Vt) of 0.5 L, an

inspiratory capacity of 3.5 L, and a functional residual capacity (FRC) of 2.5 L. What

is his expiratory reserve volume (ERV)?

Selected Answer:

1.5 L

Correct Answer:

1.5 L

 Question 39

1 out of 1 points

A 62-year-old man at sea level breaths a gas mixture containing 21% O2. He has the

following arterial blood gas values: PaO2 = 60 mm Hg PaCO2 = 70 mm Hg Which of

the following is the cause of his hypoxemia?

Selected Answer:

Hypoventilation

Correct Answer:

Hypoventilation

 Question 40

1 out of 1 points

The most important muscle of inspiration is the;

Selected Answer:

Diaphragm

Correct Answer:

Diaphragm

 Question 41

1 out of 1 points

Which of the following causes of hypoxia is characterized by a decreased arterial

Po2 and an increased A–a gradient?

Selected Answer:

Right-to-left cardiac shunt

Correct Answer:

Right-to-left cardiac shunt

 Question 42

1 out of 1 points

A 12-year-old boy has a severe asthmatic attack with wheezing. He experiences rapid

breathing and becomes cyanotic. His arterial Po2 is 60 mm Hg and his Pco2 is 30 mm

Hg. Which of the following statements about this patient is most likely to be true? (

Selected

Answer:

His arterial Pco2 is lower than normal because hypoxemia is causing him to

hyperventilate

Correct Answer:

His arterial Pco2 is lower than normal because hypoxemia is causing him to

hyperventilate

 Question 43

1 out of 1 points

In a maximal expiration, the total volume expired is;

Selected Answer:

vital capacity (VC)

Correct Answer:

vital capacity (VC)

 Question 44

1 out of 1 points

If a person's arterial blood has a pH of 7.22 and pCO2 of 20 mm Hg, what is the HCO

3− concentration?

Selected Answer:

7.9mEq/L

Correct Answer:

7.9mEq/L

 Question 45

1 out of 1 points

Which person would be expected to have the largest A–a gradient?

Selected Answer:

Person with pulmonary fibrosis

Correct Answer:

Person with pulmonary fibrosis

 Question 46

1 out of 1 points

Which is not a consistent finding in a patient who is engaged in moderate exercise?

Selected Answer:

A greater V/Q mismatch

Correct Answer:

A greater V/Q mismatch

 Question 47

1 out of 1 points

Which volume remains in the lungs after a maximal expiration?

Selected Answer:

Residual volume (RV)

Correct Answer:

Residual volume (RV)

 Question 48

1 out of 1 points

Compared with the systemic circulation, the pulmonary circulation has a;

Selected Answer:

lower resistance

Correct Answer:

lower resistance

 Question 49

1 out of 1 points

In patients with acute respiratory distress, accessory muscles of inspiration are

recruited to help them breath. These muscles include the sternocleidomastoid,

scalenes and the muscles of the anterior abdominal wall.

Selected Answer:

False

Correct Answer:

False

 Question 50

0 out of 1 points

In the hemoglobin–O2 dissociation curves, a rightward shift could be caused by;

Selected Answer:

carbon monoxide (CO) poisoning

Correct Answer:

strenuous exercise

BIOM 525 Liberty University Human Physiology Lecture Quiz 4 PRACTICE 2022.pdf

Students also viewed