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5 Cards in this Set

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Biological Clocks
Endogenous physiological timing mechanisms that rhythmically modulate functioning of individual cells, tissues, organs, and unicellular & multicellular organisms.

Biological clocks control changes in physiological states
Rhythm
Regular, cyclical variation in function
Endogenous Rhythm
Rhythms that continue in the absence of environmental information about time of day
Circadian Rhythm
An endogenous rhythm with a period of APPROXIMATELY (but never exactly) 24 hours.

All eukaryotes and some prokaryotes exhibit circadian rhythmicity (activity, body temperature …)
Circannual Rhythm
An endogenous rhythm with a period of APPROXIMATELY (but never exactly) 365 days (reproductive, hibernation, migration)