Phosphocreatine act-Muscle contraction and relaxation

How does phosphocreatine act in the muscle contraction and relaxation?

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

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