A motor neuron plus the muscle fibers to which it attaches is called a motor unit.

Name: A motor neuron plus the muscle fibers to which it attaches is called a motor unit.
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A motor unit consists of a motor neuron and the muscle fibers it innervates. When the motor neuron fires an action potential, all the muscle fibers in the motor unit contract together. The size of a motor unit can vary depending on the fine motor control needed for a particular muscle.

A Motor Neuron Plus the Muscle Fibers to Which It