The Role of the Endogenous Pacemaker in the Control of the Cicadian Rhythm

THE ROLE OF THE ENDOGENOUS PACEMAKER IN THE CONTROL OF THE circadian RHYTHM. The bodys biological beatniks atomic trope 18 controlled by an interaction between endogenous maudlin sinoatrial nodes (internal clocks) and exogenous zitegebers (external clock or cues). Animals and plants wipe out evolved endogenous pacemakers to service maintain their natural metre with the environment, yet there ar fluctuations in the Earths cycle such as monthlong days in summer hence exogenous zitegebers help our body to take into account different fluctuations in our environment. both(prenominal) the endogenous pacemaker and the exogenous zitegibers control our circadian rhythm which last for about a day, one drill of this is our fill-in kindle cycle. Studies done by Micheal Siffre where he spent extended time in ohmic resistance caves without exogenous zitegibers alike sunlight, noise, clocks, etc necessitate supported the existence of endogenous pacemakers in our repose wake up cycle as his results showed that his sleep wake rhythm settled to an average 24 hour cycle. However this vanquish could be criticized for lacking validity as it could be considered to be a case study hence it only describes the demeanor of one individual ( Micheal Siffre) and cannot be generalized to the population. In extension to this, the conditions he faced in the caves such as melt off temperatures and the use of a dim light might run through affected his sleep wake cycle. However Shiffres results are supported by various studies including Aschoff and Wever (1976) study where participants stayed in an secret WWII bunker without exogenous zitegibers and the results showed that most of the participants displayed a sleep wake cycle of 24 to 25 hours. The main endogenous pacemaker in mammals is the Suprachiasmatic Nucleus (SCN); a cluster of nerve cells case-hardened in the hypothalamus whose neurons have an in built circadian rhythm. It is connected to the retina of the eye so it can detect the amou! nt of sunlight. It likewise attached to the pineal gland; a small pea plant shaped...If you want to get a full essay, indian lodge it on our website: OrderEssay.net

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