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Chloe Blunden

Discuss the role of endogenous and exogenous cues in the role of circadian
rhythms (24 marks)
Endogenous pacemakers are our internal body clocks that help to manage our rhythms, such as
the suprachiasmatic nucleus, melatonin, the pineal gland and the hypothalamus which can be
influenced by exogenous zeitgebers…

Page 2

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Chloe Blunden

difficult for him that he had to use stimulants and sedatives to send him to sleep and wake him up
again. This gives great support for exogenous zeitgebers as it shows they play a significant role in
resetting our rhythms, especially our sleep-wake cycle. To further the support…


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