Which of the following is NOT a neurotransmitter that plays a role in controllingwakefulness (arousal)?a. Histamineb. Melatoninc. Serotonind. Acetylcholinee. Norepinephrine
Question
Which of the following is NOT a neurotransmitter that plays a role in controllingwakefulness (arousal)?a. Histamineb. Melatoninc. Serotonind. Acetylcholinee. Norepinephrine
Solution
The answer is b. Melatonin. Melatonin is a hormone that regulates sleep-wake cycles, not a neurotransmitter. It is produced in response to darkness and is suppressed by light. It does not play a direct role in wakefulness or arousal like the other options listed. Histamine, serotonin, acetylcholine, and norepinephrine are all neurotransmitters that have been shown to play a role in maintaining wakefulness and arousal.
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