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Whats involved in Homeostasis.

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Introduction

Homeostasis Homeostasis involves various processes to keep the conditions inside the body constant. This allows conditions outside the body to change and have no immediate effect on the body. This needs to happen so that biochemical reactions inside the body can continue. The enzymes involved in these reactions are sensitive to changes in temperature and pH. If the environment is not kept constant these enzymes may denature. A constant water potential also needs to be kept so that osmosis can occur, supplying surrounding cells with their fluid. Homeostatic systems are used to decrease the impact of fluctuating conditions outside the body. To do this several organs must be co-ordinated so that the relevant information can be sent to and from the brain. ...read more.

Middle

So when there is a lack of glucose in the blood the area may malfunction. The three sources of blood glucose are: * Digestion of carbohydrates in the diet * Breakdown of glycogen * Conversion of none-carbohydrate compounds The pancreas plays a large part in controlling the glucose levels. It contains cells which are sensitive to glucose concentration in the blood. It then produces either insulin when the concentration is to high, or glucagon if the levels get to low. Insulin does this by activating enzymes that convert glucose to glycogen, and others, which promote the synthesis of fat. Glucagon activates enzymes in the liver which are responsible for converting glycogen to glucose. ...read more.

Conclusion

There are two types of diabetes mellitus: * Type 1 or insulin dependent * Type 2 or insulin independent Another part of homeostasis in temperature control, different organisms control their temperature in different ways. Ectothermic organisms control their bodies' temperature by changing their behaviour. Birds and mammals are the only animals which do not do this. Examples of how they do this is moving into shade, having darker outer colours (absorbing more heat). Endothermes are animals that can maintain a stable temperature by using both behavioural and physiological methods. Mammals and birds are examples of endothermes. When humans get goosebumps it is an example of our behavioural method to reduce the loss of heat. Physiological changes include how blood temperature can rise or fall when the hyperthalimus detects a change in temperature and allows the autonomic nervous system to act in the appropriate way. Jamie Evans ...read more.

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