Which of the source of atp for muscle contraction

ATP is required for muscle contraction. Four sources of this substance are available to muscle fibers: free ATP, phosphocreatine, glycolysis and cellular respiration. A small amount of free ATP is available in the muscle for immediate use.

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electronic measurement tools display data on a screen after waiting for several minutes.

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explanation:

materials water oxygen those are the things i can think of in this moment.