Compared to its partial pressure in the atmosphere, oxygen's partial pressure in the alveoli is
A) higher.
B) lower.
C) equivalent.

Name: Compared to its partial pressure in the atmosphere, oxygen's partial pressure in the alveoli is A) higher. B) lower. C) equivalent.
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Question

Quizplus · Accepted Answer

The partial pressure of oxygen in the alveoli is lower than in the atmosphere due to the mixing of incoming air with residual alveolar air and the presence of water vapor and carbon dioxide in the alveoli.

Compared to Its Partial Pressure in the Atmosphere, Oxygen's Partial