Question

Why cant we inhale nitrogen?

Answer 1

Dear frnd, We are all of us (humans, animals and plants) nitrogen-dependent because every protein has nitrogen as one of the constituting elements.
Humans get their nitrogen for making proteins from vegetable and/or animal sources. Even plants (and bacteria) that can fix nitrogen do not use nitrogen from the air in a direct way for building proteins, but in the form of ammonia or in the form of nitrates.

Why do we need Oxygen-
Oxygen can react with carbohydrates by an exothermic reaction, thus delivering energy. I do not know of similar reaction of nitrogen with possible food components.

Hope it helped u!
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