How much oxygen does a human need per average breath of air?

In an average gasp of air, only 15-20% is oxygen. When you exhale you release around 10%. In short, 10% would be the ideal minimum.
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What is the average breathing rate for humans?

Normal heart rate (at rest) is about 72 beats per minute Explanation :At rest, the heartbeats of a healthy person is regular. As the heart pushes blood through the arteries t… (MORE)