Endogenous Pacemakers And Exogenous zeitgebers

Question 1

What are endogenous pacemakers?

Answer 1

• our internal body clock
• regulate biological rhythms
• e.g SCN and pineal gland affect Sleep wake cycle
• affected by environment
• can still function without external cues

Question 2

Describe how the SCN (suprechiasmatic nuclei)

Answer 2

• SCN in hypothalamus
• regulated by light
• recovers light when eyes are closed so bio clock can adjust whilst asleep