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Question

Approximate normal composition of alveolar air is?

A
14%O2,6%CO2,80%N2
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B
16%O2,3%CO2,81%N2
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C
21%O2,2%CO2,77%N2
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D
10%O2,8%CO2,82%N2
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Solution

The correct option is A 14%O2,6%CO2,80%N2
Alveolar air represents the air located in the respi­ratory part of the lungs which takes part in gas ex­change with the blood in the pulmonary capillaries. The air is mixed with nitrogen approximately 70-80%, oxygen around 13-14%, 5-6% carbon dioxide, and water vapour around 5-6%.
So, the correct option is A.

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