final; ch. 11 steps of contraction
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4 Terms
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myosin ATPase, an enzyme located on the myosin head, breaks down ATP that is bound to the head into ADP and phosphate. The energy released cocks the head into position.
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The cocked myosin head binds to an active site on the thin filament to form a cross bridge
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The myosin head releases the ADP and phosphate as it flexes back into position, tugging the thin filament along. This is called the powerstroke
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The myosin-actin bond is broken when a new ATP binds to the myosin head
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