What is the composition of inhaled air?

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Multiple Choice

What is the composition of inhaled air?

Explanation:
Inhaled air is composed mainly of oxygen, nitrogen, and a very small amount of carbon dioxide. The typical, accepted mix is about 21% oxygen, 79% nitrogen, and around 0.04% carbon dioxide. This reflects the normal atmospheric composition you breathe before any gas exchange occurs in the lungs; the CO2 level is a tiny trace, not a large fraction. The other given mixtures either overstate the oxygen (too high), understate it (too low), or inflate the carbon dioxide content, which isn’t how fresh air is inhaled.

Inhaled air is composed mainly of oxygen, nitrogen, and a very small amount of carbon dioxide. The typical, accepted mix is about 21% oxygen, 79% nitrogen, and around 0.04% carbon dioxide. This reflects the normal atmospheric composition you breathe before any gas exchange occurs in the lungs; the CO2 level is a tiny trace, not a large fraction. The other given mixtures either overstate the oxygen (too high), understate it (too low), or inflate the carbon dioxide content, which isn’t how fresh air is inhaled.

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