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the THICK protein filament of myofibrils that interacts w/ actin to shorten the sarcomere + contract the muscle> myosin binds to actin to cause this shortening/contraction of the muscle fiber

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1. the THICK protein filament of myofibrils that interacts w/ actin to shorten the sarcomere + contract the muscle
> myosin binds to actin to cause this shortening/contraction of the muscle fiber





 
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