Motor units are responsible for the contraction of muscle fibers. If impulses from the neurons reach the muscle fibers, the sarcomeres that lie between the actin and the myosin filaments become stimulated. This process results in the contraction of muscles.

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Chapter 12, Problem 13UYK

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Introduction: Motor units are responsible for the contraction of muscle fibers. If impulses from the neurons reach the muscle fibers, the sarcomeres that lie between the actin and the myosin filaments become stimulated. This process results in the contraction of muscles.

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