ATP binds to the myosin head Hydrolysis of ATP causes the head to come to a “cocked” position. Then the head binds to the actin binding site creating a cross-bridge ADP and Pi are released from the myosin, causing the myosin head to pivot and push the actin filament towards the center of the sarcomereThe head attaches to a new ATP to start a new cycle. This further pushes the actin filaments to the center of the sarcomere. Contraction may continue as long as there are calcium ions free.
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