A motor unit is
A) the bundle of axons that goes from the spinal cord to a muscle.
B) one of the connective tissue-wrapped bundles of muscle fibers in a muscle.
C) a motor neuron and all of the muscle fibers it controls.
D) the muscle or group of muscles that accomplishes a specific movement.

Question

Quizplus · Accepted Answer

A motor unit consists of a motor neuron and all of the muscle fibers it controls. These muscle fibers contract together when the motor neuron is activated. Option A refers to a group of axons, option B refers to fascicles, and option D refers to muscles or muscle groups, which may consist of multiple motor units.

A Motor Unit Is