A motor unit is
A)many myofibrils in a sarcolemmA.
B)many motor end plates at a neuromuscular junction.
C)a motor neuron and the muscle fibers connected to it.
D)the functional unit of a muscle fiber.

Question

Quizplus · Accepted Answer

A motor unit consists of a single motor neuron and all the muscle fibers it innervates. Therefore, option C is the correct answer. Option A is incorrect as myofibrils are the structural units of muscle fibers, not motor units. Option B is incorrect as motor end plates are the area of the muscle fiber where the motor neuron releases acetylcholine to stimulate the muscle contraction, not the motor unit itself. Option D is incorrect as it refers to the sarcomere, which is the functional unit of a muscle fiber, not the motor unit.

A Motor Unit Is