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The energy "currency" of the human body is ATP (adenosine triphospate). Your body produces ATP in a variety of ways, and without getting into some heavy physiology, I'll put it like this:

Every cell in the human body needs two things: oxygen and glucose. The cells then use these two things to create large amounts of ATP using a process called "oxidative phosphorylation". When oxygen or glucose aren't available, you body tries other processes to produce ATP, but these other methods don't produce very much ATP - which is why you can't survive for long without oxygen or glucose! (You get glucose from food)

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14y ago

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