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circadian rhythm
(redirected from Circadian cycle)

    Also found in: Medical, Wikipedia, Hutchinson 0.01 sec.
circadian rhythm: see rhythm, biological rhythm, biological, cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the environment.
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circadian rhythm

Inherent cycle of approximately 24 hours in length that appears to control or initiate various biological processes, including sleep, wakefulness, and digestive and hormonal activity. The natural signal for the circadian pattern is the change from darkness to light. The controlling mechanism for these cyclic processes within the body is thought to be the hypothalamus. Any change in the circadian cycle (such as jet lag and other conditions associated with travel) requires a certain period for readjustment.
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Other experiments demonstrated that inhibiting production of Timeless protein seriously compromised checkpoint-regulated coordination of cell division, "indicating an intimate connection between the circadian cycle and DNA damage checkpoints.
Timeless protein plays a role in coupling cell cycle and circadian ... by Phelps, Jerry / Environmental Health Perspectives
She points out that Drosophila become arrhythmic in response to constant light and revert to a circadian cycle when light and darkness alternate again.
Senior bees up all night caring for larvae by Milius, S. / Science News
The body's circadian cycle is a 24-hour cycle which controls functions such as body temperature, digestion and respiration and induces us to fall asleep at night and stay awake during daylight hours.
Shiftwork a challenge for aging worker by Ross, Ian / Northern Ontario Business
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