Question

A motor unit is defined as:

A) all the muscle cells in a whole muscle
B) all the muscle cells innervated by a single motor neurorn
C) all the neurons that nnervate a single whole muscle
D) the total force at which a whole muscle can generate

Answer 1

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

Step-by-step 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.