Word: seretonin
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...researchers found that there were drastic chemical differences between a sleeping and a waking brain. When a person is not asleep, one of the two groups of neurons in Hobson's model, called aminergic neurons, processes the hormones norepinephrine and seretonin, which can control bodily functions. On the other hand, if someone is engaged in REM sleep, the other set of neurons, referred to as cholinergic, become receptive to the hormone acetylcholine for muscle control...
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