A motor unit in a skeletal muscle is defined as all the
A)muscle fascicles found in a single muscle.
B)muscle fibers controlled by a single motor neuron.
C)myofibrils in a single muscle fiber.
D)muscle fibers used in a single movement.
E)none of the choices is correct

Question

Quizplus · Accepted Answer

A motor unit is defined as a single motor neuron and all the muscle fibers it controls. Therefore, choice B is the correct answer as it describes a group of muscle fibers controlled by a single motor neuron. Choices A, C, and D do not accurately define a motor unit.

A Motor Unit in a Skeletal Muscle Is Defined as All