42. A student in your lab volunteers to enter a hypoxic breathing chamber for 10

Question

42. A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO2
drops to 50 mm Hg. What other change would occur?
A. decrease in arterial pH
B. decrease in arterial PCO2
C. decrease in pH of cerebrospinal fluid
D. increase in alveolar PCO2
E. hypoventilation

43. Jill lives in St. Louis, which is close to sea level. She decides to spend a month of her summer vacation
working in the mountains outside of Denver. After a week in the mountains, what kinds of changes would
you expect to see as Jill adapts to the higher altitude?
A. decreased hematocrit
B. decreased blood pressure
C. decreased alveolar ventilation rate
D. decreased PO2 in the alveoli
E. all of the above

44. Voluntary apnea (i.e., breath-holding) for 60 seconds will
A. Decrease alveolar PCO2
B. Increase arterial PO2
C. Inhibit the arterial chemoreceptors
D. Increase alveolar PCO2

45. Which of the following play a part in the increase in ventilation with moderate exercise?
A. Reflexes from moving limbs
B. Decrease in body temperature
C. Fall in arterial PO2
D. Rise in arterial PCO2

Explanation / Answer

42. D. increase in alveolar PCO2 43. D. decreased PO2 in the alveoli 44. A. Decrease alveolar PCO2 45. B. Decrease in body temperature

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