Examlex
Define positive and negative symptoms. Give examples of each.
Melatonin
A hormone secreted by the pineal gland that plays a role in setting circadian rhythms.
Biological Rhythms
Natural processes that cyclically change over a period of time in living organisms, such as the circadian rhythm or menstrual cycle.
Onset of Sleep
The transition period from wakefulness to sleep, marking the beginning of the sleep cycle.
Hypersecretion
Abnormally increased output of a secreted material. Compare with hyposecretion.
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