I am a relatively fast-acting chemical messenger that affects mood, hunger, sleep, and arousal. What am I?

I am a relatively fast-acting chemical messenger that affects mood, hunger, sleep, and arousal. What am I?

I am a relatively fast-acting chemical messenger that affects mood, hunger, sleep, and arousal. What am I?








A) acetylcholine
B) dopamine
C) norepinephrine
D) serotonin










Answer: D