How Much Oxygen Do We Inhale and Exhale?

Answer

We inhale about 20% oxygen, since this is what the air contains. We exhale between about 14 to 16% oxygen. The fact that we retain oxygen even after we exhale is what makes CPR possible.
Q&A Related to "How Much Oxygen Do We Inhale and Exhale?"
We inhale air that is 78% nitrogen, 21%
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Because when you exhale, carbon dioxide comes out, NOT OXYGEN.
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There is a seldom discussed circulation called lymphatic. Ones intracellular fluid is refreshed with this circulation. Blood does not carry carbon dioxide, for the most part. In the
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Not Medical Advice: Aerobic organisms require oxygen to release energy via respiration, in the form of the metabolism of energy-rich molecules such as -more? report this answer. Updated
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