Question is in the details because it’s long, I need help with ap biology homework?
When a person exercises for muscle cells supply energy via cellular respiration if the intensity of the exercise crosses a specific threshold the supply of oxygen may not be great enough to support aerobic respiration what this happens to muscle cells will switch from aerobic respiration to anaerobic respiration specifically what type of anaerobic respiration will muscle cells use
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That's called lactic acid fermentation. It's also why muscles get sore and in extreme cases cramp.