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The motor unit = a motor neuron + the muscle fibers it innervates.

A muscle cell is innervated by only one neuron.

An alpha motor neuron may innervate many muscle fibers (3-2000).

The fewer fibers involved, the finer the muscle control will be. Cell bodies for the alpha motor neurons are located in the spinal cord.

Acetylcholine is the neurotransmitter between the motor neuron and the muscle cell, and the muscle cell has nicotinic receptors.