Which of the following structures are responsible for the contraction of muscle fibers?

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Muscle cells (fibers)contract only because they are stimulated to do so by motor axons.A motor axon branches,and each branch terminates very close to a muscle cell.This region,called a neuromuscular junction,contains a synaptic cleft (Fig.29.7C).A nerve impulse traveling down an axon causes the axon terminals to release the neurotransmitter.

Which of the Following Structures Are Responsible for the Contraction