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Biological Rhythms

Infradian Rhythm ­ a rhythm lasting more than 24hrs
Circadian Rhythm ­ a rhythm lasting 24hrs
Ultradian rhythm ­ a rhythm lasting less than 24 hrs
Circadian Rhythm: the sleepwake cycle
The suprachiasmitic nucleus (SCN) is in the hypothalamus, just above the optic chasm so it can gain…

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Evolutionary reason: Women's menstrual cycles coincide so women have babies at same time so mothers can care
for all babies




Thank you! This is really useful! 

It's in note form and lists lots of really useful AO2 points :)

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