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What are the 4 steps in muscle contraction?

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What are the 4 steps in muscle contraction?

1) Resting Stage: ADP+Pi bound to cocked myosin head 2) Myosin binding: Ca+ binds troponin, myosin binds exposed actin 3) Powerstroke: ADP+Pi dissociate; myosin head pulls and sarcomere contracts 4) ATP binding: ATP binds myosin; myosin dissociates from actin

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