circadian rhythm

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circadian rhythm:

see rhythm, biologicalrhythm, biological,
or biorhythm,
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

[sər′kād·ē·ən ′rith·əm]
A self-sustained cycle of physiological changes that occurs over an approximately 24-hour cycle, generally synchronized to light-dark cycles in an organism's environment.
References in periodicals archive ?
The human clock is controlled by our genes, and the research suggests that some people may be more at risk of the effects of circadian desynchrony than others.
Electric light allowed humans to override an ancient synchronization between the rhythm of the human clock and the environment, and over the last century, daily rhythms in meal, sleep and working times have gradually disappeared from our lives," said Wyse.
The study of the human clock, which resides in a tiny collection of brain cells called the suprachiasmatic nucleus, has become a pressing issue.
Washington, August 30 ( ANI ): In a new study, researchers have focussed on how the human clock struggles to stay in tune with the irregular meal, sleep and work schedules of the developed world, and how this might influence health and even cause obesity.
However, he hints that the use of bright lights may someday serve to reset the human clock in the elderly--whose biological clocks tend to "speed up" with age -- or in physicians and other workers who must toil through the night.
The plant photolyase structure provides a much better model to use to study how the cryptochrome proteins in the human clock function than we have ever had before," says Dr.

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