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

Question

Quizplus · Accepted Answer

A motor unit consists of a single alpha motor neuron and all the muscle fibers it innervates. The other options are incorrect. A motor junction is not a recognized anatomical term; intrafusal units are specialized muscle fibers found within muscle spindles, which are not directly innervated by alpha motor neurons; antagonistic units are pairs of muscles that work in opposition to each other.

A Single Alpha Motor Neuron and the Muscle Fibers It