Your body needs more oxygen when you are exercising than when your are not. Why is this?

The lungs bring oxygen into the body, to provide energy, and remove carbon dioxide, the waste product created when you produce energy. The heart pumps the oxygen to the muscles that are doing the exercise. When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.

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zara♡

Every one of these activities uses up energy that must be replaced in part by taking in more oxygen. When you exercise, your muscles move more vigorously than when you are at rest. ... You need oxygen to produce ATP, so the more ATP you produce, the more oxygen your body requires.

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