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Circadian Rhythms - Essay Example

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The writer of this essay aims to describe the basic aspects of circadian rhythms - the biological or physiological rhythms, which are controlled by internal biological clocks. Furthermore, the paper reveals certain internal and external factors interrupt the normal sleep pattern…
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Circadian Rhythms
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"Circadian Rhythms"

Download file to see previous pages Circadian rhythm takes place in wide variety of organisms apart from humans and are controlled by environmental and internal factors. Temperature and light are the common environmental factors. The circadian cycle is controlled by suprachiasmatic nucleus located in hypothalamus region of brain that influences the sleep-wake cycle by receiving signals from retina of eye about light and dark. The photoreceptor cells in retina transmit signals on light activation and deactivation via neurons of retinohypothalamic tract to the SCN, which are further transmitted to pineal gland via the superior cervical ganglion. Circadian rhythm takes place in wide variety of organisms apart from humans and are controlled by environmental and internal factors. Temperature and light are the common environmental factors. The circadian cycle is controlled by suprachiasmatic nucleus located in hypothalamus region of brain that influences the sleep-wake cycle by receiving signals from retina of eye about light and dark. The photoreceptor cells in retina transmit signals on light activation and deactivation via neurons of retinohypothalamic tract to the SCN, which are further transmitted to pineal gland via the superior cervical ganglion.  The superior cervical ganglion releases noradrenaline into pineal cells during dark, which is followed by transformation of serotonin into melatonin. The SCN leads to the release of more melatonin hormone from pineal gland when the light levels are low that in-turn influences the brainstem mechanisms. ...Download file to see next pagesRead More
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