Which of the following must be true of the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction?

 The following statement about the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction must be true: Axons must have structures that make and secrete molecules, and muscle cells must have receptors that recognize these molecules. The axon conducts electrical impulses (action potentials) away from the nerve cell body.

Ibelieve the answer is d.

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