Control of circadian rhythms

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The main pacemaker is the Suprachiasmatic nulceus, a small group of cells in the hypothalamus generating a circadian rhythms reset by light entering the eyes. A rhythm is produced from the interaction of proteins, prodcing a biological clock.

  • Morgan (1995) found that removing the SCN cells from hamsters made circadian rhythms disappear, but they retrned when cells were transplanted in, illustrating the


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