Marco Ball-Albarran




Discuss the role of endogenous pacemakers in the control of one or more rhythms
(24 marks)

Endogenous pacemakers are internal biological clocks that manage our rhythms. In humans, the main
biological clock is the suprachiasmatic nucleus (SCN) which is located in the hypothalamus and controls
circadian rhythms.
The…

Marco Ball-Albarran




zeitgeber which is important in reducing the natural 25 hour rhythm to 24 hours and work alongside
endogenous pacemakers.

On the other hand, sleep-wake studies supporting the existence of endogenous pacemakers have
reported a consistent finding of 25 hours; Miles found a blind man who had a circadian…