A muscle fiber is stimulated to contract when receptors on the _________ bind with acetylcholine released into the synaptic cleft by the terminal bouton of the ________.
A)motor neuron; sarcolemma
B)sarcolemma; motor neuron
C)sarcomere; motor neuron
D)synaptic vesicles; motor neuron

Question

Quizplus · Accepted Answer

The correct answer is B) sarcolemma; motor neuron. When a motor neuron releases acetylcholine into the synaptic cleft, it binds with receptors on the sarcolemma (the muscle fiber's cell membrane), initiating muscle contraction.

A Muscle Fiber Is Stimulated to Contract When Receptors on the _________