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Nitrogen does enter the body. Remember, we don't breathe in just oxygen and carbon dioxide. we breathe in AIR and it contains many gases. We only utilize Oxygen for respiration. Though nitrogen is needed by our body, we only take it in the from of food in our diet.

The nitrogen we breathe in is an inert gas meaning it does not react with any substance. So the nitrogen we breathe in is breathed out eventually.

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12y ago

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