In man, expired air contains oxygen about

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10%

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16%

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20%

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Solution

The correct option is C 16%
Inhaled air contains more oxygen used to create energy and less CO $_{2}$ . It contains 21% O $_{2}$ , 0.04% CO $_{2}$ and 79% Nitrogen. Exhaled air contains 16% O $_{2}$ , 4% CO $_{2}$ and 79% Nitrogen. Thus, option C is correct.

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Expired air when compared to inspired air contains

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