Motor Units

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Chapter: Anatomy and Physiology for Health Professionals: Support and Movement: Muscle Tissue

Each muscle fiber has a single motor end plate, although motor neuron axons have many branches connecting the motor neuron to various muscle fibers.

Motor Units

Motor Units

Each muscle fiber has a single motor end plate, although motor neuron axons have many branches connecting the motor neuron to various muscle fibers. When an impulse is transmitted, all con-nected muscle fibers contract at the same time. A motor unit is a functional structure consisting of a motor neuron and the muscle fibers it innervates (FIGURE 9-8).


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