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Sleep and Biological Rhythms
Biological Rhythms
Biological rhythms are patterns of physiological + psychological processes, repeated over a period of
time. Help animals measure time + enable them to anticipate and respond to change.

Circadian Rhythms ­bodily cycles that occur every 24 hourse.g. sleep/wake cycle.


Sleep/wake cycle is biologically determined…

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Infradian Rhythms ­bodily cycles that last longer than a daye.g. menstrual cycle.


Female menstrual cycle determined by release of oestrogen + progesterone under control of
pituitary gland (EP), function to regulate ovulation. (EP initiate + maintains rhythm)
Average cycle is 28 days , goes through 4 stages : menstrual phase,…

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