The percentage of oxygen in the inhaled air is ___.

10%

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21%

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19%

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21%

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Solution

The correct option is
C

21%
Inhaled air contains more oxygen used to create energy and less carbon dioxide. Exhaled air contains more carbon dioxide produced as a waste product of energy production and less oxygen as it has been used in respiration. Inhaled air contains 21% oxygen, 0.04% CO2, and 79% N 2. Exhaled air contains 16% oxygen, 4% CO2, and 79% N2.

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The percentage of oxygen in inhaled air is 21%.

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