Examlex
Ice is ________ (less/more)dense than liquid water.
Suprachiasmatic Nucleus
A small region in the brain’s hypothalamus responsible for controlling circadian rhythms, which are the body's internal biological clock.
Pineal Gland
A small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep-wake cycles.
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness cycles.
Hormone
A chemical substance produced in the body that serves as a messenger, regulating and coordinating various physiological activities.
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