Which of the following is indirectly responsible for minute-to-minute control of breathing?
a. CO2 levels
b. HCO3? levels
c. Lactate levels
d. Oxygen (O2) levels
ANS: A
As the H+ ions in the CSF are generated in direct relation to the level of arterial PCO2, it is really the arterial PCO2 that (indirectly) controls primary minute-to-minute ventilation.
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