This study shows that the circadian rhythm persists without the cues of natural light, which demonstrates the existence of an endogenous clock. Retrieved May 22, , from https: This study was supported by Aschoff and Wever who placed participants in an underground bunker without any external cues , and found that many participants displayed circadian rhythms of between 24 and 25 hours. A limited time offer! Discuss the Disruption of Biological Rhythms. However this research may raise some ethical issues as it can be seen to breach the terms of animal cruelty, as it may cause the hamsters to become psychologically unhealthy. However some of the circadian rhythms of those in the bunker were as long as 29 hours, showing that individual differences can effect the results meaning this study and the case study of Michael.

Literature Review Dissertation chapter: Get custom essay sample written according to your requirements Urgent 3h delivery guaranteed Order Now. The normal hamsters the began to display the 20 hour circadian rhythm of the mutant hamster. An example of the way endogenous pacemakers control our circadian rhythms is a case study on Michael Siffre. How to cite this page Choose cite format: This study was supported by Aschoff and Wever who placed participants in an underground bunker without any external cues , and found that many participants displayed circadian rhythms of between 24 and 25 hours. The blind man was exposed to different exogenous zeitgebers such as clocks and social cues, but they found that none of these factors reduced his biological clock to 24 hours, and he had to take stimulants in the morning and sedatives at certain times at night to reduce his biological rhythm in time with the rest of the world.

Retrieved May 22,from https: An example of the way endogenous pacemakers control our circadian rhythms is a case study on Michael Siffre. We will write a custom essay sample on Discuss the Role of Endogenous Pacemakers specifically for you.

Discuss the Role of Endogenous Pacemakers

This study shows that the circadian rhythm persists without the cues of natural light, which demonstrates the existence of an endogenous clock. This happens even when our eyes are shut, due to them being so thin, meaning that if our endogenous clocks are pwcemakers e.

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How to cite this page Choose cite format: This study was supported by Aschoff and Wever who placed participants in an underground bunker without any external cuesand found that many participants displayed circadian rhythms of between 24 and 25 hours.

Discuss the Disruption of Biological Rhythms. The main endogenous pacemaker in mammals is the suprachiasmatic nucleus SCNwhich is located in the hypothalamus.

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Endogenous Pacemakers and Exogenous Zeitgebers Essay Plan

Discuss the role of endogenous pacemakers in the control of circadian rhythms [AO1 8 marks, AO2 16 marks] An endogenous pacemaker is an internal biological clock that controls the way in which many of our biological rhythms behave. His findings showed that the free running endogejous settled down to a regular rhythm which is little over 24 hours.

Want to get a price estimate for your Essay? Discuss the Role of Endogenous Pacemakers Discuss the role of endogenous pacemakers in the control of circadian rhythms [AO1 8 marks, AO2 16 marks] An endogenous pacemaker is an internal biological clock that controls the way in which many of our biological rhythms behave.

The normal hamsters the began to display the 20 hour circadian rhythm of the mutant hamster.

endogenous pacemakers essay

However this research may raise some ethical issues as it can be seen to breach the terms of animal cruelty, as it may cause the hamsters to become psychologically unhealthy. This proves that endogenous pacemakers play a large role in circadian rhythms, as it showed that the sleep cycle in the hamsters depended on biological factors from with in the brain. The blind man was exposed to different exogenous zeitgebers such as clocks and social cues, but they found that none of these factors reduced his biological clock to 24 hours, and he had to take stimulants in the morning and sedatives at certain times at night to reduce his biological rhythm in pacemakefs with the rest of the world.

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Discuss the Role of Endogenous Pacemakers. At night, when there is no light, the SCN then sends a message to the pineal gland, causing it to increase the production of melatonin, which induces sleep pacemakerss preventing the brains mechanism to promote wakefulness.

Exogenous Zeitgebers and endogenous pacemakers essay – Document in A Level and IB Psychology

Siffre cannot be generalised to the wider population. Literature Review Dissertation chapter: However this study can be criticized as it is only a case study of one man, meaning it lacks population validity and cannot be generalised to the wider population.

However some of the circadian rhythms of those in the bunker were as long as 29 hours, showing that individual differences can effect the results meaning this study and the case study of Michael. Get custom essay sample written according to your requirements Urgent 3h delivery guaranteed Order Now.

endogenous pacemakers essay

Also the endgenous can be criticized as it only shows the effect of the SCN on hamsters essah cycles and cannot be generalised to humans as hamsters have much smaller brains and are also nocturnal animals meaning that light does not effect their circadian rhythms, the same way it does ours. In conclusion, I think that endogenous pacemakers do play a very large role in helping to maintain our circadian rhythms, however this is also with the help of various exogenous zeitgebers which help keep the rhythms precise.

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