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Homeostatic mechanisms I have monitored.

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Homeostatic mechanisms I have monitored Homeostasis comes from the Greek words, homeo meaning constant and status meaning state or condition. This describes how the body needs to be kept at a constant state in order to work efficiently and reliably. The skin is a receptor monitoring temperature and uses feedback control sending messages to the brain and then to the organs. This keeps the body in balance. Key measurements of homeostatic functions are body temperature, breathing patterns, lung volume (peak flow), and blood pressure. A change in these can help identify dysfunction of homeostatic balance which could be fatal if not treated or could be signs of shock when an accident has occurred. Body temperature is one of the measurements I have taken, if body temperature rises or falls below or above 37 �C, the body will become hypothermic if low and hyperthermia if high. At 27�C the body will become unconscious and the heart will stop if below 25�C. So the body's temperature control is very important. Homeostasis works by causing the body to shiver as this will contract muscles, causing cells to work with respiration to increase the oxygen intake. ...read more.


To avoid error when measuring lung volume I will make sure that candidates are not wearing restrictive clothing. I will also ask if they are on any medication which affects respiration as this may affect the results. Homeostatic dysfunction may produce abnormal data This can be due to the bodies systems not correcting themselves back to normal levels. During exercise temperature rises and homeostatic controls start to work to drop the temperature back to normal. If these controls were not working the body temperature would continue to rise. The lungs are made to work faster and deeper during exercise which pushes the heart to work faster, if homeostasis does not work then the candidate will find it difficult to keep breathing at the rate it needs to, to supply the body with oxygen. The blood pressure and pulse rate would continue to increase. Causes of dysfunction of the homeostatic controls could be any metabolic illness such as diabetes, any brain tumours or brain damage such as head injuries which could effect the brains messages to the vital organs, lung disease and dysfunction such as asthma or lung cancer, infections which will effect temperature control, large burn injuries as the skin surface has been changed and other medical conditions. ...read more.


Analyse of Carly's results Carly has a very rapid respiratory rate at rest which does not rise as much as expected during exercise. Although she has a high respiratory rate her lung volume is great. Carly's lung volume changes very slightly after exercise and returns to the resting rate almost straight away. Carly's temperature reading at rest is very similar to that of Sarah C and Sarah W, but after exercise it rises dramatically. This show that Carly's body homeostatic functions need to work harder to rebalance the bodies systems. Carly has told us that she smokes and does little exercise, this would account for the low lung volume and high reparatory rate as her body needs to work harder to balance itself. This in turn produces more heat. Both Sarah W and Carly have low lung volume readings, this is more likely due to Carly smoking and Sarah W having asthma. Both of these candidates have very different temperature and respiratory rates, this could be due to their general fitness. All three candidates' results vary because of the physical fitness, medical conditions and the amount of effort put into each test. Unit 3 - Physical Aspects of Health ...read more.

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