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Do human breath nitrogen

Updated: 10/23/2021
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6y ago

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As 78% of the air consists of nitrogen, when we breathe the air most of what we breathe in is nitrogen, so, in a way, the answer is 'yes'.

However, this nitrogen has no effect on the workings of our body and so it is emitted again when we breathe out. The only gas in the air which is used by our bodies is oxygen which, when we breathe in, is absorbed by the lungs and passed to the bloodstream. At the same time waste carbon dioxide is passed from our bloodstream to the air we breathe out via our lungs. Around 21% of the air is oxygen which is only marginally reduced in the air we breathe out which explains why we can give mouth-to-mouth resuscitation as there is plenty of oxygen left even in air we breathe out - enough to keep someone else alive during resuscitation if necessary.
Yes, nitrogen is roughly 80% of the air you breath. However it simply acts as an inert gas, not being used by the body.
Humans breathe air order to obtain oxygen (20% of air).

The component of air that we're after is the second most abundant one ... oxygen,

comprising about 20% of what we breathe in. The #1 most abundant component of the

mixture, at 78%, is nitrogen. Since we are not plants, we do fine without nitrogen, and

simply breathe that part back out.

Some divers prefer to use a "breathing gas" that does not contain any nitrogen, in order to avoid "decompression sickness" (also called "the bends") and nitrogen narcosis.
Humans cannot breathe nitrogen, but it is necessary for living organisms. Microorganisms such as bacteria chemically change the nitrogen to nitrogen compounds that are then used by plants. Herbivores eat the plants, and carnivores eat the herbivores. In this way, animals are able to receive nitrogen in a usable form.

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Osbaldo Fadel

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2y ago
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Q: Do human breath nitrogen
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