Respiratory Review Questions

Question 1

The respiratory zone of the respiratory system is mainly

responsible for bringing air into and out of the lungs.

Answer 1

false

Question 2

Which of the following options is NOT considered
an anatomic dead space of the respiratory system?
A. Trachea
B. Nose
C. Alveolar sac
D. Bronchi

Answer 2

C

Question 3

Hyperventilation leads to:
A. Increase in PCO2
B. Decrease in PO2
C. Respiratory alkalosis
D. Respiratory acidosis

Answer 3

C

Question 4

If the lung volume increases, the resistance in

the airways will also increase

Answer 4

false

Question 5

Which of the following options is NOT true about the factors that
influence the rate of gas movement between alveoli and blood?
A. CO2
is more soluble than O2
B. The driving pressure gradient
for O2
is bigger than for CO2
C. The thickness of the respiratory
membrane is always constant
D. The greater the alveolar
capillaries perfused, the greater
the gas exchange

Answer 5

C

Question 6

At the level of the alveoli, CO2 diffuses into the

respiratory tract and O2 diffuses into the blood.

Answer 6

true

Question 7

Cor pulmonale is:
A. A cardiac consequence of
pulmonary hypotension
B. A cardiac consequence of
pulmonary hypertension
C. A pulmonary consequence of
cardiac failure
D. A pulmonary consequence of
increased cardiac output

Answer 7

B

Question 8

Which of the following options is NOT true
about CO2 exchange?
A. PCO2 in mixed venous blood
is 46 mm Hg
B. PCO2 in arterial blood is 40
mm Hg
C. PCO2 diffuses into the alveoli
at the pulmonary level
D. PCO2 difuses out of the blood
at the tissue level

Answer 8

D

Question 9

The respiratory zone is lined with mucussecreting

and ciliated cells

Answer 9

false

Question 10

Mark the option that better represents the most
important way to transport CO2 in the blood:
A. Dissolved
B. Combined with Hemoglobin
C. Combined with plasma
proteins
D. As Bicarbonate

Answer 10

D

Question 11

How many molecules of O2 each hemoglobin
molecule is capable to transport?
A. 2
B. 4
C. 6
D. 8

Answer 11

B

Question 12

When blood PCO2 increases, the affinity of
hemoglobin for O2 decreases.
A. True
B. False

Answer 12

A

Question 13

Which of the following options is NOT part of
the breathing control system?
A. Respiratory centers at brain
stem
B. Chemoreceptors for O2 and
CO2
C. Macrophages
D. Respiratory muscles whose
activity is directed by the
brain stem centers

Answer 13

C

Question 14

Mark the option that better describes the
major role of the pneumotaxic center:
A. Controls the basic rhythm of
respiration
B. Prevents overinflation of the
lungs
C. Control the duration of
inspiration
D. Operates as an overdrive
mechanism when high levels of
pulmonary ventilation is
required

Answer 14

C

Question 15

Central chemoreceptors are highly sensitive to an increase
in______ and send signals to _________ pulmonary ventilation.
A. pCO2; increase
B. pCO2; decrease
C. pO2; increase
D. pO2; decrease

Answer 15

A

Question 16

Where the peripheral chemoreceptors for O2
and CO2 are located?
A. In the lungs
B. In the muscles
C. In the brain
D. In the vascular system

Answer 16

D

Question 17

With a decrease in PO2, the firing rate of the sensory neurons
synapsing with peripheral chemoreceptors increases
A. True
B. False

Answer 17

A

Question 18

Which of the following options is a non
respiratory function of the lungs:
A. Ventilation
B. Respiration
C. Gas exchange
D. Platelet biogenesis

Answer 18

D

Question 19

Large particles usually deposit onto the
mucocilliary system by diffusion.
A. True
B. False

Answer 19

B

Question 20

The layer responsible for entrap inhaled
particles in the mucocilliary system is:
A. Sol layer
B. Gel layer
C. Wattery layer
D. Cillia

Answer 20

B