38. The most important chemical regulator of respiration is A. oxygen. B. carbon

Question

38. The most important chemical regulator of respiration is
A. oxygen.
B. carbon dioxide.
C. bicarbonate ion.
D. sodium ion.
E. hemoglobin.

39. Carbon dioxide is more soluble in water than oxygen. To get the same amount of oxygen to dissolve in
plasma as carbon dioxide, you would have to
A. decrease the temperature of the plasma.
B. increase the partial pressure of oxygen.
C. decrease the partial pressure of nitrogen.
D. increase the rate of plasma flow through the lungs.
E. decrease the alveolar ventilation rate.

40. The chloride shift occurs when
A. hydrogen ions leave the red blood cells.
B. hydrogen ions enter the red blood cells.
C. bicarbonate ions enter the red blood cells.
D. bicarbonate ions leave the red blood cells.
E. carbonic acid is formed.

41. For maximum efficiency in loading oxygen at the lungs,
A. the pH should be slightly acidic.
B. the temperature should be slightly lower than normal body temperature.
C. the PO2 should be about 70 mm Hg.
D. DPG levels in the red blood cells should be high.
E. all of the above

Explanation / Answer

38. The most important chemical regulator of respiration is
A. oxygen.
B. carbon dioxide.


39. Carbon dioxide is more soluble in water than oxygen. To get the same amount of oxygen to dissolve in
plasma as carbon dioxide, you would have to

D. increase the rate of plasma flow through the lungs.


40. The chloride shift occurs when

D. bicarbonate ions leave the red blood cells.


41. For maximum efficiency in loading oxygen at the lungs,
A. the pH should be slightly acidic.

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