Discuss the Role of Endogenous Pacemakers and Exogenous Zeitgebers in Biological Rhythms Essay Endogenous pacemakers and exogenous zeitgebers are used to control biological rhythms. Biological rhythms are controlled by environmental factors such as light, temperature and food availability; these are known as exogenous (external) zeitgebers.
Discuss the Role of Endogenous Pacemakers and Exogenous Zeitgebers. There are 3 biological rhythms in the body.Circadian, which is our body clock which works to a 24-hour cycle and regulates our bodies biochemical, physiological and behavioural processes.Ultradian processes, which are smaller processes that happen inside our 24-hour circadian cycle.Biological rhythms are regulated by endogenous pacemakers, which are the body’s internal biological clocks, and exogenous zeitgebers, which are external cues, including light, that help to regulate the internal biological clocks.Exogenous zeitgebers influence biological rhythms: these can be described as environmental events that are responsible for resetting the biological clock of an organism. They can include social cues such as meal times and social activities, but the most important zeitgeber is light, which is responsible for resetting the body clock each day, keeping it on a 24-hour cycle.
On this page, you will find some of the recordings from our recent series of webinars titled 'The Edge in Psychology'. These videos will focus on Endogenous Pacemakers and Exogenous Zeitgebers for the Biopsychology Topic. Biopsychology: Pacemakers and Zeitgebers Explained Biopsychology: Pacemakers.
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From this case study we can conclude that endogenous pacemakers and exogenous zeitgebers need to interact to be synchronised. We can confirm that in the absence of light the SCN becomes free-running and it is desynchronised with exogenous zeitgebers.
So, endogenous pacemakers can keep a rhythm but exogenous zeitgebers are needed to stick to a 24 hour rhythm. Where is the brain's internal clock? The suprachiasmatic nucleus (SCN) in the hypothalamus is a bundle of nerves with an inbuilt circadian rhythm. This is a particularly important endogenous pacemaker.
EVALUATION Boivin et al (1996) found that Circadian Rhythms can be entrained by ordinary dim lighting (although bright light is more effective) Exposure to artificial lighting disrupts Circadian Rhythms and the production of the hormone Melatonin (induces sleepiness) PRACTICAL.
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Discuss the role of endogenous pacemakers and exogenous zeitgebers in biological rhythms. Essay by lovabebabe, High School, 12th grade, A-, October 2008 download word file, 13 pages download word file, 13 pages 0.0 0 votes.
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