Ch. 11 Steps of contraction phase
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4 Terms
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Step 1
Myosin ATPase breaks down ATP, and the energy that is released moves the myosin head into a cocked position.
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Step 2
The cocked myosin head binds to an active site on the actin of the thin filament to form a cross-bridge.
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Step 3
The myosin head undergoes a power stroke, tugging the thin filament along as it moves.
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Step 4
The myosin-actin bond is broken when a new ATP binds to the myosin head.
Note 
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