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When do humen breth anaenrobically and What is happens?

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November 26, 2008 3:12AM

Humans never breathe anaerobically. Respiration in cells can occur without adequate oxygen, but lactic acid builds up as a byproduct, and can be destructive. This is why your muscles ache after exercise. After you stop, heavy breathing increases oxygen which in turn breaks down the lactic acid, restoring equilibrium.