Question

What is the correct choice?

2) A motor unit is a motor neuron and

a. the muscle it innervates.

b. all the other motor neurons with which it is normally active.

c. all the muscle fibers it innervates.

d. the parts of the muscle that functionally act as a unit during some movement.

Answer 1

C) all the muscle fibers it innervates.

Rationale:

A motor unit is generally made up of motor neuron in the spinal cord and the muscle fibers, which are innervated by the axons of motor neutrons.

It is the basic structural unit of skeletal muscle. Muscle fibers are made up of same type of fibers in a motor unit.

Whenever a motor unit gets activated the contraction of muscle fibers occurs.

Inorder to contract a single muscle group of motor units work together which is known as muscle pool.

Based on the type of muscle fibers they innervate motor units differ and does their function.

Generally the force of muscle is regulated by the rate of recruitment and discharge of motor unit.

Hope this helps you:)