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Calcium ion channels open up so calcium can enter the neuron. Sodium channels open up, which caused Na to flow, this is called depolarization. This causes ATP that moves along the sarcolemma. Repolarization occurs when the K channels open up. The potassium starts to flow across the sarcolemma.

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Step 1:  ATP is going down the sarcolemma and the T tubule

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Step 2: step one causes the SR to release Ca2+ to flow into cytosol.

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Step 3 and 4: Ca2+ becomes one with troponin. It also takes away blocking action of tropomyosin by the change of actin in shape. This allows myosin to be exposed. Then myosin binds to actin making a cross

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Step 3: ATP attached to myosin head then it detach

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step 1: the head of myosin that has high engergy attach to actin myofilamaments making a cross bridge

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step 2: myosin head pulls actin filiament towards M line

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Step 4: ATP energy cocks myosin head into high energy state for the next process