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Homoeostasis - Case Study Example

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The brain in turn responds by limiting the rate of the heartbeat. Thus, the heart will beat slower, decreasing the blood pressure. In addition, the blood vessels become dilated, reducing…
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Download file to see previous pages Any fluctuation in the blood glucose concentration is detected by the pancreas, which in turn responds by secreting insulin. The secreted insulin increases the conversion of glucose to glycogen. As a result, Mary’s blood glucose concentration reduces (IHW 2006).
Trekking causes excess loss of water from the body in the form of sweat. As a result, the osmolality of the blood plasma rises. The increasing osmolality (stimulus) of the plasma is detected by the hypothalamus (receptor/coordinating center), triggering the secretion of ADH. ADH (effector) causes the opening of aquaporin channels in the collecting ducts of the kidney. In the process, more water is reabsorbed from the urine into the bloodstream. The reabsorption of more water (response) reduces the osmolality of the plasma. However, if alcohol is ingested, it inhibits the secretion of ADH, making the aquaporin channels to close. As a result, the body loses more water in the form of dilute urine (MMHE n.d., p. 1192).
Since Jason had put on a short sleeve shirt, the peripheral nerve receptors in his skin detected the surrounding temperature and relayed an appropriate message to the hypothalamus. The hypothalamus in turn stimulated his skeletal muscles, causing him to shiver. Although the shivering generated heat by friction, it was not sufficient to normalize Jason’s body temperature. However, when Jason decided to run, the activity in his muscles intensified and generated sufficient heat to keep him warm. As a result, the shivering stopped because his body had gained the necessary heat (Docherty & Foudy 2006, p. 20).
Dampney, RAL, et al. (2006). Central mechanisms underlying short-term and long-term regulation of the cardiovascular system. Available at: http://www.ncbi.nlm.nih.gov/pubmed/11985533 [Accessed 11 December ...Download file to see next pagesRead More
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