Partial pressure of oxygen in the inspired and expired air is respectively.

159

and

116

mm Hg

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158

and

40

mm Hg

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100

and

95

mm Hg

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40

and

95

mm Hg

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Solution

The correct option is A $159$ and $116$ mm Hg
Gases are diffused by simple diffusion mainly based on pressure or concentration gradient. There are various factors which affect the rate of diffusion.
Solubility of gases
Thickness of membrane
Partial pressure
As we know that gases are diffused according to their partial pressure. For example, $O_{2}$ is diffused from atmospheric air (inspired) having partial pressure 159 mm Hg to the alveoli where p $O_{2}$ is less, i.e., 116 mm Hg.
Therefore, Correct Option would be A.

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