ENDOGENOUS PACEMAKERS ESSAY

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 by preventing the brains mechanism to promote wakefulness. Siffre cannot be generalised to the wider population. Literature Review Dissertation chapter: 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. An example of the way endogenous pacemakers control our circadian rhythms is a case study on Michael Siffre.

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. Get custom essay sample written according to your requirements Urgent 3h delivery guaranteed Order Now. 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. This study shows that the circadian rhythm persists without the cues of natural light, which demonstrates the existence of an endogenous clock. Siffre cannot be generalised to the wider population. 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 by preventing the brains mechanism to promote wakefulness.

Discuss the role of endogenous pacemakers in control of one or more biological rhythms (8+16 marks)

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.

Siffre cannot be generalised to the wider population. This study shows that the circadian rhythm persists without the cues of natural light, which ejdogenous the existence of an endogenous clock. 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.

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Discuss the Role of Endogenous Pacemakers | Free Essays –

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. 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 pqcemakers rhythms behave.

endogenous pacemakers essay

An example of the way endogenous pacemakers control our circadian rhythms is a case study on Michael Siffre. At night, when there is no light, the SCN then sends a message to the pineal gland, causing it endogeenous increase the production of melatonin, which induces sleep by preventing the brains mechanism to promote wakefulness.

This happens even when our eyes are shut, due to them being so thin, meaning that if our endogenous clocks are slow e. This proves that endogenous pacemakers play a large role in circadian rhythms, as it showed that ewsay sleep cycle in the hamsters depended on biological factors from with in the brain. Literature Review Dissertation chapter: A limited time offer!

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.

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. 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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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 Pacemaksrs.

We will write a custom essay sample on Discuss the Role of Endogenous Pacemakers specifically for you. The normal hamsters the began to display the 20 hour circadian rhythm of the mutant hamster. Discuss the Disruption of Biological Rhythms. Get custom essay sample written pacemakes to your requirements Urgent 3h delivery guaranteed Order Now.

endogenous pacemakers essay

Also the research can be criticized as it only shows the effect of the SCN on hamsters sleeping 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.

His findings showed that the free running cycle settled down to a regular rhythm which is little over 24 hours.

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The main endogenous pacemaker in mammals is the suprachiasmatic nucleus SCNpacemzkers is located in the hypothalamus.