Partial pressure of oxygen in alveolar air is?

45

mm Hg

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125

mm Hg

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100

mm Hg

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104

mm Hg

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95

mm Hg

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Solution

The correct option is D $104$ mm Hg

Gas exchange between the air within the alveoli and the pulmonary capillaries occurs by diffusion.
Gas moves from a region of high partial pressure to a region of low partial pressure, down a partial pressure gradient.
The partial pressure of oxygen in the alveolar air is about 104-107 mm Hg and that in the capillaries is about 40 mm of Hg.
So, the correct answer is '104mm Hg'

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