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Lactic acid is a by-product of fermentation. It was once believed that it causes muscle fatigue, but modern scientists are unsure if it reduces fatigue through increased intracellular calcium or increases fatigue through reduced sensitivity of contractile proteins to Ca2+.

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9y ago
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15y ago

When you exercise or do some strenuous activity involving your muscle cells, they will go into oxygen debt, meaning your body cannot deliver the oxygen at the rate you are using it at. This lack of oxygen means your muscle cells will start performing anaerobic respiration, instead of aerobic respiration. Anaerobic respiration causes ethanol and CO2 to form in plants and yeast, however, in Humans, it built a lactate (or lactic acid). This lactic acid will then later be broken down to CO2 and H2O when your body can repay the O2 debt.

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15y ago

chemical causes, such as poisoning or mineral or vitamin deficiencies. ...

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Q: What could be a chemical cause of fatigue?
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