Which of the following will occur during even strenuous exercise in a normal healthy individual?
a. Blood gases remain stable.
b. The arterial PCO2 rises.
c. The arterial pH falls.
d. The arterial PO2 falls.
ANS: A
Strenuous exercise increases carbon dioxide production and O2 consumption by as much as 20-fold. Ventilation normally keeps pace with CO2 production, keeping PaCO2, PaO2, and arteri-al pH constant. Because arterial blood gases do not change, elevated carbon dioxide or hypoxia does not stimulate ventilation in healthy individuals during exertion.
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