The partial oxygen pressure is maximum in?

Alveolar air

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Arterial blood

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Venous blood

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Expired air

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Solution

The correct option is D Expired air
The partial pressure of oxygen is maximum in the expired air which is around 116 mm Hg. During expiration, the oxygen that could not be inhaled also moves out. It contributes a hike to the partial pressure in exhaled air. So the correct option is D.

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