At the very beginning of exhalation, the PETCO2 normally should be at what level?
a. 0 mm Hg
b. 15 mm Hg
c. 25 mm Hg
d. 40 mm Hg
ANS: A
Initially, the expired PCO2 is 0 mm Hg, indicating exhalation of pure dead space gas.
Health Professions
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