Question

Why do sometimes skeletal muscles respire anaerobically?

Answer 1

Anaerobic respiration occurs during high-intensity exercises when your body works so hard there is a shortage of oxygen for energy consumption. Due to the shortage of oxygen, your body breaks down glucose and phosphates stored in your muscles for energy. The byproduct is lactic acid, which causes muscle fatigue.

Answer 2

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Anaerobic respiration produces an oxygen debt. This is the amount of oxygen needed to oxidise lactic acid to carbon dioxide and water.

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