Question

A motor unit is defined as:

Answer 1

Answer:

The answer is B: All the muscle cells innervated by a single motor neurorn.

Explanation:

It is called a motor unit, all muscle fibers that are innervated by a motor neuron cell. A motor neuron cell can establish contact with up to 150 muscle fibrils, which when activated causes their simultaneous contraction, therefore, all the muscle fibers of a motor unit contract and relax at the same time.