Caption: A muscle sarcomere shortens during contraction due to cross bridge cycling. Because actin is tethered to structures located at the lateral ends of each sarcomere, called the z disc, any pulling of the actin filament results in a shortening of the sarcomere and thus the muscle.

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Keywords: actin, cross bridge cycling, muscle, myofibril, myosin, myosin head, power stroke, sarcomere, troponin

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Muscle Sarcomere

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Duration: 00:00:18.07

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