Body Clocks Additional Information
Circadian rhythm: A daily cycle of biological activity of approximately 24 hours. It is driven by an internal clock and influenced by regular variations in the environment, such as the alternation of night and day.
Hormone: A chemical compound that is produced in a gland and then carried to another part of the body by the blood. Hormones control many important body activities, such as growth. Hormones act by causing and adjusting chemical reactions in the body.
Sleep: A natural...
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