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Question

Why is alveolar air not of the same composition as that of atmospheric air?


A
Moisture dilutes pO2 of alveolar air
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B
pO2 in alveolar air is less than atmospheric air
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C
Moisture increases pO2 of alveolar air
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D
pO2 in atmospheric air is less than atmospheric air
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Solution

The correct options are
A Moisture dilutes pO2 of alveolar air
B pO2 in alveolar air is less than atmospheric air
Alveolar air not of the same composition at the inspired atmospheric air for 2 reasons:
  1. There is a lot of moisture and water vapour that also exerts partial pressure. Humidification of inspired air in effect “dilutes” the partial pressure of the inspired gases.
  2. Aveolar pO2 is lower than atmospheric pO2because fresh inspired air is mixed with large volume of old air that remained in the lungs as well as the dead space at the end of the preceeding expiration.

Biology

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