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circadian rhythm |
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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. ..... Click the link for more information. . circadian rhythmInherent 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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| Those of us interested in circadian rhythms and cancer predicted this a long time ago," says epidemiologist Richard Stevens of the University of Connecticut Health Center in Farmington. Under normal conditions our body maintains what is called a circadian rhythm (from the Latin circa dies, meaning "approximately one day"). There was no impairment of the circadian rhythm and pulsatile secretion of the measured sexual hormones seen in this study. |
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circadian rhythm
