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You want to chat with your friend during class, but you're worried that the professor or other students would notice, so you choose not to talk to your friend.This illustrates
Serotonin
A neurotransmitter in the brain that plays key roles in stabilizing mood, feelings of well-being, and happiness.
Norepinephrine
A neurotransmitter and hormone involved in the body's stress response and in various cognitive and emotional functions.
Suprachiasmatic Nucleus
A small region of the brain in the hypothalamus responsible for controlling circadian rhythms, which regulate the body's sleep-wake cycle.
Melatonin
A hormone produced by the pineal gland in the brain, responsible for regulating sleep and wakefulness.
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