A motor unit is
A) a fascicle of muscle fibers
B) a whole muscle plus all the nerve fibers that innervate it
C) capable of a graded response
D) a single motor neuron and all the muscle fibers it innervates
E) all the muscle fibers required to perform a specific action

Question

Quizplus · Accepted Answer

A motor unit consists of a single motor neuron and all the muscle fibers it innervates. When the motor neuron is activated, all the muscle fibers it innervates contract together. This allows for a graded response, where the strength of the contraction can be increased by activating more motor units.

A Motor Unit Is