A single alpha motor neuron and the muscle fibers it enervates are known as a(n)
A) motor junction.
B) motor unit.
C) intrafusal unit.
D) antagonistic unit.

Question

Quizplus · Accepted Answer

A motor unit is composed of a single alpha motor neuron and the muscle fibers it innervates. The other options are not correct: 
- A motor junction is not a commonly used term in anatomy or physiology. 
- Intrafusal units are specialized muscle fibers found within muscle spindles that are involved in sensory feedback, not motor control. 
- Antagonistic units refer to pairs of muscles that work in opposition to each other, such as the biceps and triceps in the arm, and do not involve a specific motor neuron.

A Single Alpha Motor Neuron and the Muscle Fibers It