Question

1. a motor unit consists of

a) an end plate, a t - tubule, and sarcoplasmic reticulum.
b) a single motor neuron and the multiple muscle fibers it controls.
c) multiple motor neurons and multiple muscle fibers.
d) multiple motor neurons and the one muscle fiber they control.
e) one synaptic terminal button, a cleft, and an acetylcholine receptor.

Explanation:

A motor unit is defined as a single motor neuron and all the muscle fibers it innervates and controls. This is a fundamental concept in the study of muscle - nervous system interaction in physiology.

Answer:

B. a single motor neuron and the multiple muscle fibers it controls.