The role of endogenous and exogenous factors in bodily rhythms

Biological Endogenous

• Internal pacemakers
• Circidian- 24hrs
• Infradian- More than 24hrs
• Ultradian- Less than 24hrs

Pineal Gland-

• Located on top of head
• Detects light and produces melatonin if there is anticpated darkness.

Evidence

• Abraham- Injected sparrow with melatonin and they fell asleep.

SCN- Suprachiasmatic nucleus

• Located above the optic chiasm
• Responible for controlling the circidian cycles.

Evidence

• Morgan, removed…