Biological rhythms

• Difference between rhythms

  Ultradian - cycle is less than 24hrs e.g. stages of sleep(90mins)

  Circadian - cycle lasts for 24hrs e.g. Body temperature

  Infradian - cycle lasts longer than 24hrs e.g. menstrual cycle
• All biological rhythms (physical, mental, and behavioural changes over a period of time) have an important influence on how body systems behave.
• All biological rhythms are controlled by;

  • Endogenous pacemakers = internal body clock
  • And influenced by
  • Exogenous zeitgebers = external changes in the environment