Daily variations in biological and psychological processes, such as blood pressure and the secretion of hormones, are called:
A. free-running conditions.
B. REM rebound effects.
C. circadian rhythms.
D. delta brain wave activity.

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How Biological Rhythms Work

How Biological Rhythms WorkDiurnal (night and day)

How Biological Rhythms WorkDiurnal (night and day)Circadian (24 hours)

How Biological Rhythms WorkDiurnal (night and day)Circadian (24 hours)Ultradian (less than 24 hours)

How Biological Rhythms WorkDiurnal (night and day)Circadian (24 hours)Ultradian (less than 24 hours)Infradian/Circalunar (1 month)

How Biological Rhythms WorkDiurnal (night and day)Circadian (24 hours)Ultradian (less than 24 hours)Infradian/Circalunar (1 month)Circannual (1 year)