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During a muscle contraction, muscle fibers shorten when _____. myosin heads rotate when they attach to actin, causing the myosin filaments to fold in the middle.
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During a muscle contraction, muscle fibers shorten when _____.

myosin heads rotate when they attach to actin, causing the myosin filaments to fold in the middle.

User Jake Feasel
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yeah you got the answer right there
User Bwc
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