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Human biological rhythms is a subspeciality in the field of Chronobiology is that examines periodic (cyclic) phenomena in living organisms. These cycles are known as biological rhythms. "Chrono" pertains to time and "biology" pertains to the study, or science, of life. The related terms chronomics and chronome have been used in some cases to describe either the molecular mechanisms involved in chronobiological phenomena or the more quantitative aspects of chronobiology, particularly where comparison of cycles between organisms is required.

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The variations of the duration of biological activity in humans occur for many essential biological processes. These occur in animals (eating, sleeping, mating, hibernating, migration, cellular regeneration, etc), and (b) in plants (leaf movements, photosynthetic reactions, etc.). The most important rhythm in chronobiology is the circadian rhythm, a roughly 24 hour cycle shown by physiological processes in man. (The term circadian comes from the Latin circa, meaning "around" and dies, "day", meaning literally, "around a day."). This and other many other important cycles are also studied, including:



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