Why do we inhale oxygen only? why not we inhale nitrogen and other gases?
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Actually we inhale all the gases around us but only some gases like oxygen is utilised by our body.
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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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