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Biological rhythms - Coggle Diagram

- - - - 2) Pineal glans: receives info from the SCN to release the hormone melatonin which induces sleep
        
        3) Adrenal gland: receives cortisol which induces wakefulness
        
        4) Exogenous zeitgebers: external factors which are in our environment which can influence out sleep/wake cycle through entrainment, such as light which supressing the release of melatonin from the pineal gland
- - - - Endogenous pacemakers should be synchronised with the exogenous zeitgebers, this process is known as entrainment
      - S:Campbell and Murphy woke 15 ppt and shone a light on the back of the knee, this produced deviation of the usually sleep/wake cycle up to 3 hours for the ppt, this suggests that light is a powerful exogenous zeitgeber that does not necessarily even need to be the eyes to have an influence on the circadian rhythm
- - - - PA:
        
        There are potential practical applications of research into infradian rhythms.
        
        Understanding of infradian rhythms has led to effective methods being used by the NHS to support women to be more informed regarding the menstrual cycle.
        
        If menstrual cycle can be understood, this means that doctors can predict when women will ovulate, which can be used to increase the chances of conception.
        
        This means that understanding infradian rhythms can lead to an improved understanding of fertility.