A small, pea-shaped gland in the brain. Its function isn't fully understood. Researchers do know that it produces and regulates some hormones, including melatonin.
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A neurotransmitter that has a wide variety of functions in the body. It's sometimes called the feel-good neurotransmitter because it contributes to wellbeing and happiness.
Circadian Rhythms: Physical, mental, and behavioral changes that follow a daily cycle. They respond primarily to light and darkness in an organism's environment.