as I was told from early education that the air we currently breathe in contains 21% oxygen and 77-ish% of nitrogen and the rest are other particles.
So I have a dumb question on what the body uses nitrogen we breathe in for?
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There’s a common misconception that we inhale only the oxygen and exhale only carbon dioxide. Or that we completely deplete the oxygen from what we breathe. The truth is that the composition of the air barely changes during our respiratory process. It goes from 21% O2 and 0.04% CO2 to 16% and 4.4% respectively. That’s why you can breathe into a bag and reinhale the same air again and not suffocating.
The corollary to this is if we don’t even process all the oxygen, we sure as hell aren’t processing anything else in the air. We ignore all of the other gases and breath them back out
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