Raul is sitting quietly when the muscles in his left leg begin to "twitch." This activation of movement in his voluntary muscles is most likely due to the release of the neurotransmitter:
A)serotonin
B)dopamine
C)norepinephrine
D)acetylcholine

Question

Quizplus · Accepted Answer

Twitching in voluntary muscles is controlled by the somatic nervous system, which uses acetylcholine as its primary neurotransmitter at the neuromuscular junction. Serotonin, dopamine, and norepinephrine are primarily involved in the regulation of mood, behavior, and other functions in the central nervous system.

Raul Is Sitting Quietly When the Muscles in His Left