Question

What is the approximate percentage of oxygen in expired air?

Answer 1

Inhaled and exhaled air

Gas % in inhaled air % in exhaled air

Oxygen 21 16

Carbon dioxide 0.04 4

Nitrogen 79 79

NB These figures are approximate.

Answer 2

Answer:

• There is 4 to 5 percent by volume more carbon dioxide and 4 to 5 percent by volume less oxygen in exhaled air compared to that which was inhaled.
• The average composition of this expired air is as follows: 78.04 percent nitrogen, 13.6 percent to 16 percent oxygen, 4 percent to 5.3 percent carbon dioxide, and 1 percent other gases.
• Respiration is a mechanism that is required for human life. Our bodies absorb oxygen through this mechanism while exhaling carbon dioxide. Our bodies utilize this oxygen in a chemical process that creates ATP (Adenosine Triphosphate) from the food we consume.
• All of the oxygen in the air we breathe does not enter our lungs during the breathing process. The amount that is absorbed is little. Therefore, some oxygen is present in expired or exhaled air.

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