Biology

When your body runs out of oxygen, such as during intense exercise, it switches to lactic acid fermentation to continue producing ATP without oxygen. This allows your muscles to keep working temporarily, but it also leads to the buildup of lactic acid, which causes muscle fatigue.

The other options are incorrect:

Alcohol fermentation is carried out by yeast and some bacteria in the absence of oxygen. They convert glucose into ethanol and carbon dioxide. Human cells do not perform alcohol fermentation.

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