Definitions for circadian rhythm
This page provides all possible meanings and translations of the word circadian rhythm
a daily cycle of activity observed in many living organisms
The "internal body clock" that regulates the (roughly) 24-hour cycle of biological processes in animals and plants.
A circadian rhythm is any biological process that displays an endogenous, entrainable oscillation of about 24 hours. These rhythms are driven by a circadian clock, and rhythms have been widely observed in plants, animals, fungi and cyanobacteria. The term circadian comes from the Latin circa, meaning "around", and diem or dies, meaning "day". The formal study of biological temporal rhythms, such as daily, tidal, weekly, seasonal, and annual rhythms, is called chronobiology. Although circadian rhythms are endogenous, they are adjusted to the local environment by external cues called zeitgebers, commonly the most important of which is daylight.
U.S. National Library of Medicine
The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs and stimuli, hormone secretion, sleeping, feeding, etc. This rhythm seems to be set by a 'biological clock' which seems to be set by recurring daylight and darkness.
Find a translation for the circadian rhythm definition in other languages:
Select another language:
Discuss these circadian rhythm definitions with the community:
Use the citation below to add this definition to your bibliography:
"circadian rhythm." Definitions.net. STANDS4 LLC, 2014. Web. 28 Jul 2014. <http://www.definitions.net/definition/circadian rhythm>.