Circadian rhythm

From WikiLectures

Biological clock

Circadian rhythm is a biological rhythm with a period of approximately 24 hours, it can fluctuate between 20 and 28 hours (lat. circa = approximately, dies = day). These are regularly recurring changes in physiological functions, e.g. body temperature, hormone secretion, blood pressure, etc.

The circadian rhythm is one of the biorhytms.

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