Final answer:
A motor unit consists of a motor neuron and the muscle fibers it stimulates, with variations in size, recruitment, and power.
Explanation:
Motor Units
A motor unit consists of a motor neuron and the muscle fibers it stimulates. Each muscle fiber is innervated by a single motor neuron, and the group of muscle fibers innervated by one motor neuron is called a motor unit. Motor units vary in size, recruitment, and power.
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