Q: What are the partial pressure values of carbon dioxide in alveolar air and deoxygenated blood respectively?
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A
50 mm Hg, 45 mm Hg
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B
104 mm Hg, 45 mm Hg
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C
45 mm Hg, 40 mm Hg
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D
40 mm Hg, 45 mm Hg
D
Answer:
D
Explanation:
The partial pressure of carbon dioxide in alveolar air is 40 mm Hg and in deoxygenated blood it is 45 mm Hg. This means that carbon dioxide moves from arterial blood to alveoli due to the difference in partial pressure. Gas exchange takes place between the two due to this difference in partial pressure, as gases move from areas of high partial pressure to areas of low partial pressure.
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