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Biological Circadian Infradian U
Rhythms
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A circadian rhythm lasts for 24 hours. An An infradian rhythm A
AO1 example of this is the sleep-wake cycle. lasts for more than 24 n
hours but less than a u
Temporal isolation studies provide us…

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showing a limit for control of internal months without natural f
rhythms. light shortened her cycle o
to 25.7 days. Russell et r
al found that l
pheromones e
(biochemical s
Our core body temperature is lowest at substances that act like s
about 4.30AM (36°c) & highest at about…

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can occur on a seasonal m
basis and are known as
circanual rhythms. is
Seasonal affective t
disorder (SAD) makes h
sufferers depressed in e
winter. Research studies sl
have found that the e
hormones melatonin e
and serotonin are p
secreated when it is dark s
therefore the more…

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Fatema.ali

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This is THE best, thank you!

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