What is the relationship between the number of motor neurons recruited and the number of skeletal muscle fibers innervated? a) motor neurons always innervate thousands of skeletal muscle fibers. b) a skeletal muscle fiber is innervated by multiple motor neurons. c) typically, hundreds of skeletal muscle fibers are innervated by a single motor neuron. d) a motor neuron typically innervates only one skeletal muscle fiber.

c) Typically, hundreds of skeletal muscle fibers are innervated by a single motor neuron.

Explanation:

A motor neuron is a neuron that controls the effector organs such as muscles and glands. One single motor neuron usually inervates  many muscle fibres. An individual motor neuron together with all of the muscle fibers that it innervates comprises a structure called motor unit. The number of fibers innervated by a motor unit is known as innervation ratio.

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