Which of the following neurotransmitters functions as the major inhibitory neurotransmitter in the brain?
A) acetylcholine
B) serotonin
C) GABA
D) norepinephrine

Question

Quizplus · Accepted Answer

GABA (gamma-aminobutyric acid) is the major inhibitory neurotransmitter in the brain. It reduces neuronal excitability and is involved in regulating anxiety, sleep, and muscle tone. Acetylcholine, serotonin, and norepinephrine all have different functions in the brain but are not primarily inhibitory. Acetylcholine is involved in muscle movement and cognitive processes, serotonin is involved in mood and appetite regulation, and norepinephrine is involved in the body's stress response.

Which of the Following Neurotransmitters Functions as the Major Inhibitory