When we inhale 21% of oxygen is breathed and when we exhale it 16.4% comes out. Why?

The amount of air that we inhale contains 21% of oxygen and 0.04% of carbon dioxide, while the air we breathe out contains 16.4% of oxygen and 4.4% of carbon dioxide. 

It happens because inhaled Oxygen (O₂) "consumed" in the processes of cellular respiration, releases energy, and gives out carbon dioxide (CO₂), as a byproduct.

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Updated on: 10-Oct-2022

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