Which of the following statements about pulmonary physiology is correct?

A. The percentage of CO2 in the air is 0.0003.
B. The PO2 of inspired air at sea level is approximately 159 mm Hg.
C. The percentage of O2 in the air at sea level is the same as at high altitude.
D. All of these answers are correct


Answer: D

Health & Biomechanics

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