Preview

Discuss the Role of Endogenous Pacemakers and Exogenous Zeitgebers in the Sleep-Wake Cycle and at Least One Other Biological Rhythm

Good Essays
Open Document
Open Document
1443 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Discuss the Role of Endogenous Pacemakers and Exogenous Zeitgebers in the Sleep-Wake Cycle and at Least One Other Biological Rhythm
Discuss the role of endogenous pacemakers and exogenous zeitgebers in the sleep-wake cycle and at least one other biological rhythm
Endogenous pacemakers and exogenous zeitgebers can manipulate the various bodily rhythms, and have particular affects on the sleep / week cycle in the circadian rhythm. Endogenous pacemakers are separate and distinct internal rhythms that affect the bodily rhythms; similarly, exogenous zeitgebers are outside influences, and sometimes outside rhythms that also affect how the bodily rhythms work. There are copious amounts of research into these variables, however, some are contradictory towards each other and pose many questions about not only the nature of these variables but also of the bodily rhythms themselves.
Endogenous pacemakers are rhythms generated internally by the organism in the absence of exogenous zeitgebers. This definition does however, cause problems in measuring EPs alone, as even when you methodology remove the affects of EZs, you can never fully be aware of all external events that may affect the rhythm. The main EP is the supreachisatic nucleus, which generates circadian rhythms from sensitivity to light. This shows that while both EPs and EZs are important, it seems that the SCN is the overriding factor even though it is affected by the EZ of light. Evidence supporting this claim was found in the removal of the SCN in hamster, where it was found their circadian rhythm disappeared and failed to return after transplant. While this study is scientifically rigours in terms of controlling variables, you cannot generalise from hamsters to humans, we are significantly biologically different. Furthermore, this raises the issue if animal testing and the ethical issues associated with such studies. The SCN is a group of cells in the hypothalamus above the optic chiasma, which reacts to light, influencing the circadian rhythm. The SCN regulates the pineal gland which secretes melatonin in the absence of light as observed by

You May Also Find These Documents Helpful

  • Good Essays

    Discuss the role of endogenous pacemakers and exogenous zeitgebers in the circadian rhythm. 24 Markers…

    • 1205 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Infradian rhythms are biological rhythms that last for more than 24 hours. They are controlled by the hypothalamus, an endogenous pacemaker which requires input from exogenous zeitgebers so the rhythm can run correctly.…

    • 883 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Psy 315 Final

    • 1051 Words
    • 5 Pages

    The results show that the average sleep cycle is not 24 hours. This allowed us to reject the null hypothesis. We used the data to determine if the average person’s sleep cycle was 24 hours. After examining the information we see that is not the case.…

    • 1051 Words
    • 5 Pages
    Good Essays
  • Best Essays

    Wong, C. (2011, October 5). Sleep Aids. About.com Alternative Medicine. Retrieved July 26, 2012, from http://altmedicine.about.com/cs/conditionsitoq/a/Insomnia.htm…

    • 1963 Words
    • 8 Pages
    Best Essays
  • Satisfactory Essays

    There are four primary stages of sleep in which human beings cycle in and out of (Pinel, 2007). The first stage is referred to as emergent sleep. During this phase EEG waves are both low voltage and high frequency. The second, third, and fourth stages are made of higher levels of EEG voltage and a decrease in frequency. The second stage of sleep mainly process two additional characteristics which are sleep spindles and K complexes (Pinel, 2007). Delta wave patterns can happen during the third stage of sleep. As the fourth stage of sleep occurs the delta waves become the most dominant pattern within an EEG (Pinel, 2007).…

    • 340 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Nt1310 Final Exam

    • 587 Words
    • 3 Pages

    A circadian rhythm is a “biological clock” that controls when we must sleep, and when we must wake up. This 24-hour clock has been observed in plants animals, fungi, and cyanobacteria. When someone…

    • 587 Words
    • 3 Pages
    Good Essays
  • Better Essays

    Circadian rhythms occur every 24 hours; an example of a circadian rhythm is the sleep-waking cycle. We are diurnal animals who are active during the daytime and asleep at night, other animals are nocturnal they are active at night but asleep during the day. The circadian rhythm depends on the interaction of physiological and psychological processes to be tuned into the sleep-waking cycle so energy is provided when needed. As diurnal humans we have a fairly stable sleep pattern with the time we go to sleep and the time we wake up, this consistency suggests an internal mechanism controls sleep, endogenous pacemaker. However, this can be overridden by external factors, exogenous zeitgebers.…

    • 1438 Words
    • 6 Pages
    Better Essays
  • Good Essays

    There are three main biological rhythms, which are called infradian, circadian and ultradian. Ultradian rhythms occur multiple times in one day. Circadian rhythms are cycles, which occur once a day, so within the 24 hours such as the sleep-wake cycle. Infradian rhythms are less frequent once in a day such as the menstrual cycle or hibernation. The research into these rhythms offers an insight into how the body is influenced by exogenous zeitgebers and endogenous pacemakers, but it is still nonetheless unclear what it more influential.…

    • 1300 Words
    • 6 Pages
    Good Essays
  • Satisfactory Essays

    The way the body tells us we need to sleep is by the firing off of neurons from the suprachiasmatic nucleus in the brain. The suprachiasmatic nucleus controls the sleep/wake cycle, body temperature, urine production, hormone secretion and blood pressure changes.…

    • 515 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Jet lag is another example of how biological rhythms can be adjusted, but their effects are found to temporary, as travelling happens once in a while, whereas shift work may be somebody’s job which they have to be doing constantly every day. However, our biological rhythms are not equipped to cope with sudden and large changes in our rhythms. It has been found that they need approx. 1 day to adjust as each time zone is crossed. This is because the dorsal portion of the SCN needs several cycles to fully resynchronise, as it is less sensitive to light.…

    • 1149 Words
    • 5 Pages
    Good Essays
  • Good Essays

    A rhythm is something that is regularly repeated. All living organisms experience rhythmic changes which tend to coincide with seasonal or daily environmental changes. Most organisms have an internal biological clock called endogenous pacemakers, which are influences by external environmental factors called exogenous zeitgebers, these control periodic changes. The sleep wake cycle is a circadian rhythm that repeats itself every 24 hours. However these can become desynchronised, resulting in a disruption of your biological rhythm. It can be disrupted by many factors, including Jet lag and shift work.…

    • 1161 Words
    • 5 Pages
    Good Essays
  • Good Essays

    The research investigation aims to find out the sleeping patterns or sleep wake cycle (the species-specific biological pattern of alternating sleep and wakefulness, in humans) of students between the ages of 13-19. Specifically this task aims to investigate the number of hours the students sleep on weekdays compared to weekends and if the participants wake up on the preferred time on school days. It was hypothesised that teenagers (13-19 years old) are achieving less than the recommended hours of sleep (8 -9 hours) on weekends. In addition the time that they wake up on a school morning is not there preferred time. The hypothesis was supported by previous research such as research done by DR Karl S. Kruszelnicki 3 May 2007. In this research DR Kruszelnicki states that the natural circadian rhythm (A circadian rhythm is any biological process which displays oscillation of about 24 hours, they are adjusted to the local environment by external cues called zeitgebers, commonly the most important of which is daylight.)…

    • 2150 Words
    • 9 Pages
    Good Essays
  • Better Essays

    Regulatory Behavior Paper

    • 1403 Words
    • 4 Pages

    The nervous system is an extremely elaborate biological machine. Without question, the nervous system is a system so intricate and comprehensive that professionals in the field of medicine to this day do not have a “complete picture” of each of the working details of the human nervous system. Of these different mechanisms, perhaps the one most riddled with speculation, is the mechanism of sleep. In discussing regulatory process, sleep is perhaps one of the most essential to the healthy upkeep of the human nervous system. This process is such a necessary behavior that without it, the nervous system, and the overall health of the individual in question can become compromised (to the point of fatality) without it.…

    • 1403 Words
    • 4 Pages
    Better Essays
  • Better Essays

    Sleep Theories

    • 1121 Words
    • 5 Pages

    Most people think that when we sleep, we can shut down our mind. However, with the power of advanced technique, scientist made a careful observation of human brain waves, body temperature, heart rate, breathing, and other physical functions. They received a new light on sleep. Our brain and body actually are active during sleep, sometimes even more active than we are awake.…

    • 1121 Words
    • 5 Pages
    Better Essays
  • Good Essays

    My Sleep Journal Analysis

    • 644 Words
    • 3 Pages

    Sleep is considered a vital part of human life. Without sleep, the human body is unable to function properly. By recording my sleep patterns over a 72 hour time period, I was able to notice patterns in my circadian rhythm, my sleep cycle, and the effects of sleep on my body. Although I did not have any interesting dreams to analyze in my sleep journal, I did collect some interesting data.…

    • 644 Words
    • 3 Pages
    Good Essays

Related Topics