First slide

Exchange of Gases

Question

Compared to atmospheric air, the alveolar air has

Easy

A

Higher p $O_{2}$ and lower p ${CO}_{2}$
B

Lower p $O_{2}$ and higher p ${CO}_{2}$
C

Lower p $O_{2}$ and lower p ${CO}_{2}$
D

Higher p $O_{2}$ and higher p ${CO}_{2}$

Solution

In the atmospheric air, p $O_{2}$ is 159 mm Hg and p ${CO}_{2}$ is 0.3 mm Hg. In the alveolar air, p $O_{2}$ is 104 mm Hg and p ${CO}_{2}$ is 40 mm Hg.

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