"Circadian Rhythm" Essays and Research Papers

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Circadian Rhythm

Circadian rhythm Although most people tend to think that manifestations of body function such as temperature and blood pressure are constant throughout the day, the fact is that many functions change in cyclic patterns – especially those that are affected by hormones, such as cortisol. These daily fluctuations, or circadian rhythms are fundamental to all organisms, from bacteria to humans. Circadian rhythms help coordinate and synchronize our internal body functions, as well as our interactions...

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The Circadian Rhythm Effect

processes. Circadian rhythm in all mammals is a process that describes our inner master “clock” and our daily functionality.Circadian timing is structured in such a way as to receive information from the external and internal environments, and its function is the timing organization of the physiological and behavioral processes in a circadian pattern (1)”. With the 24 hour cycle put in use we determine the sleeping and feeding patterns of all animals. Since the circadian rhythm is such a vital...

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Describe and Evaluate Circadian Rhythms

Describe circadian rhythms (8marks) 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...

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Discuss the role of endogenous pacemakers and exogenous zeitgebers in the circadian rhythm

zeitgebers in the circadian rhythm. 24 Markers Circadian rhythm is rhythms that last 24 hours, one day. An example of a Circadian Rhythm is the sleep-wake cycle. Because this rhythm occurs daily, it is tempting to automatically assume that the factors which control it are exogenous zeitgebers, such as natural light patterns, TV, radio, birdsong, Research however has gone into this to find out what exactly controls the circadian rhythms. Research by Siffer implies that circadian rhythms are controlled...

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Discuss the Role of Endogenous Pacemakers in the Control of Circadian Rhythms

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. Many of these rhythms run on a 24 hour basis, such as the sleep/wake cycle, bodily temperatures and some of our hormones. The main endogenous pacemaker in mammals is the suprachiasmatic nucleus (SCN), which is located in the hypothalamus. It receives information...

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Outline and Evaluate the role of endogenous pacemakers and exogeneous zeitgebers in the control of circadian rhythms

control of circadian rhythms (8+16) Circadian rhythms are biological rhythms that occur every 24 hours, an example of a circadian rhythm is the sleep-wake cycle, another circadian rhythm is body temperature which is at its lowest at around 36 degrees at night and it peaks in the morning at 38 degrees. Endogenous pacemakers are internal body 'clocks' that will modulate biological rhythms, the SCN is an example of an endogenous pacemaker, it controls our body temperature cycle. Circadian rhythms can also...

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Outline and Evaluate one or more biological rhythms

evaluate research into one or more biological rhythms” [research = theories and studies] 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...

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Circadian Rhythms

1. Describe how circadian rhythms are associated with sleep deprivation. 2. Explain the results of the sleep deprivation assessment. 3. Do you agree, or disagree, with the results. Why, or why not? 4. If you are sleep deprived, what steps could you take to get more or better quality of sleep? Alternatively, if you are not sleep deprived, what techniques allow you to get quality sleep most nights of the week? Circadian rhythms: Their role and dysfunction in affective disorder Press...

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Discuss the Role of Endogenous Pacemakers and Zeitgebers in Biological Rhythms

biological rhythms A rhythm is something that is regularly repeated e.g. eating several times a day. These rhythms are repeated over different intervals and they are governed by both internal (endogenous) and external (exogenous) factors. An endogenous pacemaker is something internal that sets the rhythm, and an exogenous zeitgeber is something external that affects / sets the rhythm e.g. light. A biological rhythm that depends upon endogenous pacemakers is the sleep/wake cycle circadian rhythm...

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Discuss the Disruption of Biological Rhythms

Discuss the disruption of biological rhythms 24m One example of disruption of biological rhythms is due to shift work and shift lag. This disrupts your sleeping pattern because it means you are required to be alert at night, so need to sleep during the day. This reverses and disrupts your circadian rhythm, becoming desynchronised where it is no longer entrained by EZ’s. There are many consequences of desynchronisation such as sleep deprivation. Shift workers find it hard to sleep during the day...

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