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During each contraction the sarcomeres (basic unit of muscle) shortens, bringing the Z-Disks closer together.

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The release of ADP completes the cross-bridge movement and ATP attaches to myosin, breaking the actin-myosin crossbridge.

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The cross bridge pulls actin, which slides over the myosin – known as the ‘Power Stroke.’

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The Myosin head forms a ‘cross-bridge’ on the active site of the actin filament.

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Myosin heads attach to actin by breaking down ATP

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Troponin shifts tropomyosin, which was blocking the active site on the actin.

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Calcium is released from the terminal cisternal into the muscle fiber and binds to troponin.

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An action potential in a motor neuron causes acetylcholine to release in the synaptic cleft.