The control of muscle contraction does not depend upon its ability to turn the cross-bridge cycle on and off, rather it depends on motor units to carry out the advanced control of each contraction. Each motor unit consists of muscle fibers that are innervated by branches of the axon coming out of a single efferent neuron.

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Chapter 43, Problem 6TYK

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The control of muscle contraction does not depend upon its ability to turn the cross-bridge cycle on and off, rather it depends on motor units to carry out the advanced control of each contraction. Each motor unit consists of muscle fibers that are innervated by branches of the axon coming out of a single efferent neuron.

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