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The skeletal muscles in the human body are under conscious control. The instructions telling the body to move are sent via neural signals from the brain to the muscle. The neural signals travel along motor neurons. A motor neuron and the muscle fibers it connects to are together called:_______

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A single motor neuron, however, can innervate many muscle fibers. The combination of an individual motor neuron and all of the muscle fibers that it innervates is called a motor unit. The number of fibers innervated by a motor unit is called its innervation ratio

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