Which of the following is the most important chemical regulator of respiration?
a. The blood level of oxygen
b. The amount of hemoglobin in red blood cells
c. The blood level of carbon dioxide
d. The blood level of nitrogen
ANS: C
Carbon dioxide is usually the major regulator of respiration because even small changes in its blood level change the pH. Fluctuations in oxygen level have no effect on pH, and an adequate oxygen level in the blood can be maintained even if breathing ceases for a few minutes. Nitrogen does not control respirations. Hemoglobin level affects tissue oxygenation but is not the most important regulator of respiration.
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To those espousing a positivist paradigm, a fundamental belief is that:
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What is the mechanism of action for metoclopramide (Reglan), which is commonly prescribed for nausea and vomiting?
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