REM sleep is initiated by a rise in _____,which activates the cerebral cortex while the rest of the brain remains relatively inactive.

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REM sleep is initiated by a rise in acetylcholine, which activates the cerebral cortex while the rest of the brain remains relatively inactive. Other neurotransmitters such as serotonin, norepinephrine, and adenosine play a role in sleep regulation but do not initiate REM sleep.

REM Sleep Is Initiated by a Rise in _____,Which Activates