Review Questions For 3rd Midterm
Respiratory Physiology
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What is the name of the small air sacs that allow gas
exchange in the lungs?
a. bronchi
b. bronchioles
c. alveoli
d. pleurae
Which of the following contains fully oxygenated
blood?
a. pulmonary artery
b. pulmonary vein
c. pulmonary capillary
d. all of the above
What is a pneumothorax?
a. a hole in the lining of the interpleural space
b. an arteriole connecting the lung to the chest
c. a decrease in pressure of the interpleural space
d. a loss of surface area of the alveoli
Which muscles are involved in quiet, passive
breathing?
a. diaphragm
b. intercostal muscles
c. both of the above
d. neither of the above
Exhalation is what kind of process?
a. active
b. passive
During inhalation, the pressure inside the lungs is
_____ the atmospheric pressure.
a. greater than
b. less than
c. the same as
During exhalation, the pressure inside the lungs is
_____ the atmospheric pressure.
a. greater than
b. less than
c. the same as
The tidal volume is
a. the amount of air left in the lungs after expiration
b. the amount of air contained in the lungs after
inspiration
c. the amount of air in 1 breath
d. the amount of air not available for gas exchange
The volume of “dead space” in the lungs is
a. 1000 mL
b. 500 mL
c. 150 mL
d. 0 mL
Which of the following does NOT affect how much
effort breathing takes?
a. lung compliance
b. bronchiolar resistance
c. presence of surfactant
d. blood pressure
Which of the following is FALSE about surfactant?
a. it decreases the surface tension of water
b. it decreases the compliance of the lungs
c. it is composed mostly of phospholipids & protein
d. its synthesis appears late in fetal development
Which of the following is true about anaphylactic
shock?
a. bronchioles dilate
b. peripheral blood vessels constrict
c. widespread release of histamine
d. it can be treated by inhalation of acetyl choline
True or False: Hemoglobin binds carbon monoxide far
better than it binds oxygen.
14. Which of the following is FALSE about the partial
pressure of a gas in a solution?
a. it is related to the tendency of the gas to come out
of solution
b. it is related to the solubility of the gas in solution
c. it is equal to the partial pressure of the gas above
the solution at equilibrium
d. it is related to blood pressure
15. Which of the following is more soluble in water?
a. oxygen
b. carbon dioxide
16. Which of the following is FALSE about hemoglobin?
a. each hemoglobin molecule can bind 4 oxygen
molecules
b. it binds more oxygen at higher temperatures
c. it bind less oxygen at low pH
d. it increases the solubility of oxygen in blood
17. What is the partial pressure of oxygen in the lungs?
a. 100 mm Hg
b. 46 mm Hg
c. 40 mm Hg
d. 0 mm Hg
18. What is the partial pressure of carbon dioxide in the
tissues?
a. 100 mm Hg
b. 46 mm Hg
c. 40 mm Hg
d. 0 mm Hg
19. Roughly how much of your pulmonary capillaries are
collapsed during quiet breathing?
a. 10%
b. 33%
c. 50%
d. 67%
20. Most of the carbon dioxide in your blood is carried in
what form?
a. carbon dioxide
b. carbonic acid
c. bicarbonate
d. carbonate
21. What does carbonic anhydrase do?
a. increases the solubility of carbon dioxide in blood
b. lets carbon dioxide react more quickly with water
c. prevents carbon dioxide from binding hemoglobin
d. produces carbon dioxide in the tissues
22. Which situation would trigger hypoxic pulmonary
vasoconstriction?
a. high perfusion, high ventilation
b. high perfusion, low ventilation
c. low perfusion, high ventilation
d. low perfusion, low ventilation
23. Where is the respiratory control center?
a. medulla
b. cerebellum
c. cortex
d. none of the above
24. Where are the H+ sensory receptors?
a. carotid artery
b. medulla
c. both of the above
d. neither of the above
25. The lungs help to regulate blood pH by:
a. adjusting the level of bicarbonate in the blood
b. adjusting the level of oxygen in the blood
c. adjusting the level of carbon dioxide in the blood
d. adjusting the level of carbonic anhydrase in the
blood
26. True or False: Hyperventilation decreases the amount
of oxygen in your blood.