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Nerve cells called motor neurons control the skeletal muscles. Each motor neuron controls several muscle cells in a group known as a motor unit. When a motor neuron receives a signal from the brain, it stimulates all of the muscles cells in its motor unit at the same time.
Skeletal muscle cells are tipped at the end with acetylcholine receptors whose positive activation induces the cellâs respiratory contraction. The function of a motor neuron is perfectly suited to the function of muscles. The electrical signal they transmit is either positive or negative.