If energy is needed to remove a phosphate group from a chain in ATP you can conclude that the energy needed for production must be

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.

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answer increasing the intensity, duration,and frequency of exercise progressively;