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 A14%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%.