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Reptile [31]
3 years ago
12

Why does a person feel fatigue and breathe harder after exercise? What process is going on their cells?

Biology
1 answer:
DedPeter [7]3 years ago
5 0
This is because lactic acid from anaerobic respiration builds up in the muscles. It takes a while to recover from hard exercise, during which time you may still breathe heavily and have a higher heart rate than normal. ... Hard exercise causes a lack of oxygen in cells.
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