Control of circadian rhythms

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…