Question

multiple choice question
a motor unit is made up of:
o multiple nerve fibers and the muscle fiber they innervate
o a nerve fiber and all of the muscle fibers it innervates
o multiple nerve fibers and all of the muscle fibers they innervate

Explanation:

A motor unit is defined as a single nerve fiber (motor neuron) and all of the muscle fibers it innervates. This is the basic functional unit of muscle contraction in the body.

Answer:

a nerve fiber and all of the muscle fibers it innervates