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What type of respiration takes place in human muscles?

What type of respiration takes place in human muscles?

Anaerobic respiration

What are three main sources of ATP available for human muscle cells?

Humans have three main sources of ATP: ATP already in muscles, ATP made by lactic acid fermentation, and ATP produced by cellular respiration. At the beginning of a race, the body uses all three ATP sources, but stored ATP and lactic acid fermentation can supply energy only for a limited time.