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About 20%% of the air we breath is oxygen. The PaO2 (oxygen breathed in mmhg) is approximately 100 mmhg.

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How many percent of oxygen did you breathe?

On average, humans breathe in about 21% oxygen from the air.


Do you breathe out as much oxygen as you breathe in?

Yes the same amount will leave you as you take in on average but when you breathe out there will be more CO2 and less oxygen as your body uses Oxygen for it's metabolic functioning and releases CO2 in it's place. So yes same amount out as in but in a different form.


When exercsing how much oxygen do you breathe out?

The same amount you wil just breathe in more often


Do you breathe in or breathe out oxygen?

Humans breathe in oxygen and breathe out carbon dioxide. Trees "breathe" out oxygen.


Why is it harder to breathe he higher you go?

Because - the higher up the atmosphere you go - the less oxygen is in the air you breathe. Our bodies need a certain percentage of the air we breathe to be Oxygen - reduce the amount of oxygen in each breath, and it soon affects the body.


What is the process of water and oxygen combination?

A certain amount of oxygen dissolves in water (thus enabling fish to breathe).


Do we need to breathe nitrogen for survival?

No, humans do not need to breathe nitrogen for survival. The air we breathe is mostly made up of oxygen, with only a small amount of nitrogen. Our bodies use the oxygen in the air for respiration, not the nitrogen.


Why do you breathe faster after running hard and after playing hard?

Breathing is when your body is getting oxygen to your cells. When you are physically active your cells use the oxygen faster so you have to breathe faster to get the same amount of oxygen to your cells


Do humans breathe out only carbon dioxide or carbon dioxide with a little amount of oxygen?

we breath out a little oxygen aswell


Is the greatest amount of gas in the air oxygen?

No it isn't. It is Nitrogen, which makes up 70% of the air we breathe.


Do you breathe in oxygen or carbon dioxide?

You breathe in oxygen.


Do humans need nitrogen to breathe for survival?

No, humans do not need nitrogen to breathe for survival. The air we breathe is primarily made up of oxygen, with only a small amount of nitrogen.