Q.
Among the following the partial pressure of oxygen is maximum in
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Breathing and Exchange of Gases
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Solution:
The partial pressure of oxygen in maximum in the expired air (116 mm Hg) because during expiration the oxygen that could not be inhaled also moves out, contributing to more partial pressure in exhaled air.
A. Alveolar air has 104 mm Hg of partial pressure of oxygen.
B. Arterial blood has 95 mm Hg partial pressure of oxygen.
C. Venous blood has 40 mm Hg partial pressure of oxygen.
D. Expired air has 116 mm Hg partial pressure of oxygen.
So, the correct answer is 'Expired air'