Canadian Medical Guide > Biological Sciences > Physiological Processes > Chronobiology > Periodicity Terms and Definitions




Periodicity

Medical Definition: The tendency of a phenomenon to recur at regular intervals; in biological systems, the recurrence of certain activities (including hormonal, cellular, neural) may be annual, seasonal, monthly, daily, or more frequently (ultradian).
Guide Notes: IM + coord with specific dis for periodically occurring dis (IM); no qualif; do not confuse with PERIODIC DISEASE, a specific clin entity: see Dorland
Also Called: Biorhythms
Periodicity Categories.
Canadian Medical Guide Definition Circadian Rhythm - 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.

Periodicity Medical Definitions and Terms

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