why we humans just inhale O2 from surroundings why not other gases like nitrogen etc
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Explanation:
Basically when air fills our alveoli, by the process of diffusion, only oxygen in the air is taken into the blood stream while the other gases along with the waste CO2 is exhaled. So you do breathe in nitrogen, but it is exhaled as it is by the body.
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Answer:
Humans inhale air from the surroundings that means we inhale all gases from the surroundings but when the air reaches our lungs.Our body uses only oxygen.
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