Stimulation to increase ventilation does not occur until the PaO2 falls below what level?
a. 90 mm Hg
b. 80 mm Hg
c. 70 mm Hg
d. 60 mm Hg
ANS: D
When pH and PaCO2 are normal (pH = 7.40 and PaCO2 = 40 mm Hg), the carotid bodies' nerve-impulse transmission rate does not increase significantly until the PaO2 decreases to ap-proximately 60 mm Hg.
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