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Relaxation and muscle contraction

Describe, how does phosphocreatine acts in the relaxation and muscle contraction?

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Phosphocreatine states the chief means of storage of energy of the muscle cells. During, relaxed periods ATP molecules are generally formed by the aerobic cellular respiration to transfer the highly energized phosphate groups to creatine forming the phosphocreatine. In the exercise periods phosphocreatine and ADP resynthesize the ATP in order to dispose the energy for the muscle contraction.

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