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How phosphocreatine acts in relaxation and contraction

How phosphocreatine acts in the muscle relaxation and contraction?

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Phosphocreatine is the major means of energy storage for muscle cells. Throughout relaxed periods ATP molecules made up by the aerobic cellular respiration transfer greatly energized phosphate groups to creatine making phosphocreatine. In exercise periods, phosphocreatine and ADP resynthesize ATP to dispose energy for muscle contraction.

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