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Multiple Choice Quiz
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1

Functions of the respiratory system include
A)regulation of blood pH.
B)protection against microbes.
C)producing or activating chemical messengers.
D)A and B.
E)A, B and C.
2

At the end of an unforced expiration
A)the pressure of the intrapleural fluid is the same as atmospheric pressure.
B)the alveolar pressure is less than atmospheric pressure.
C)the tendency for the lungs to recoil to an unstretched state is balanced by the tendency of the chest wall to expand.
D)A and B.
E)A and C.
3

An infant born with immature type II alveolar cells
A)will have abnormally low lung compliance.
B)will have too few alveoli for efficient gas exchange.
C)will have increased airway resistance.
D)will have emphysema.
E)A and C.
4

Which of the following is not true of a person with abnormally low lung compliance? The person
A)must work harder than a normal person to inspire the same amount of air.
B)must have a greater than normal intrapleural pressure to inspire the same amount of air.
C)may have thicker lung tissues than a normal person.
D)may have greater alveolar surface tension than a normal person.
E)may have a defect in type II alveolar cells.
5

A healthy young man has a total lung capacity of 6 L, a residual volume of 1 L, and an anatomic dead space of 150 ml. Which of the following statements is/are correct?
A)With a tidal volume of 500 ml and a breathing rate of 10 breaths/minute, his alveolar ventilation would be 5 L/minute.
B)Doubling the breathing rate of A) would double his minute volume.
C)Doubling the depth of respiration of A) would double his alveolar ventilation.
D)A and B.
E)B and C.
6

Which of the following stimuli would increase the flow of blood through a systemic capillary bed?
A)Decreased PO2 of the capillary blood.
B)Increased PO2 of the capillary blood.
C)Increased sympathetic stimulation of the arterioles leading to the bed.
D)A and B.
E)B and C.
7

Which of the following stimuli would increase the flow of blood through a pulmonary capillary bed?
A)Decreased PO2 of the capillary blood.
B)Increased PO2 of the capillary blood.
C)Increased PCO2 of the capillary blood.
D)A and B.
E)B and C.
8

The affinity of hemoglobin for O2 is
A)decreased in rapidly metabolizing tissues.
B)increased at higher than normal body temperatures.
C)increased at higher than normal blood 2,3-DPG levels.
D)decreased at lower than normal blood acidity (higher pH).
E)described by all of the above.
9

Carbon monoxide is a gas that binds to heme iron with a higher affinity than does oxygen. Breathing a gas mixture with normal sea level PO2 and carbon monoxide would therefore be an example of
A)hypoventilation.
B)hypoxic hypoxia.
C)histotoxic hypoxia.
D)anemic hypoxia.
E)hypotension.
10

Which of the following statements regarding the transport of O2 in blood is true?
A)Most of the O2 carried by blood is dissolved in plasma.
B)None of the O2 carried by blood is dissolved in plasma.
C)Most of the O2 carried by blood is bound to iron.
D)The O2 of venous blood is greater than the PO2 of arterial blood.
E)B and C.





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