Homeostasis - Homeostasis Homeostasis is the regulation and...

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Homeostasis Homeostasis is the regulation and maintaing of the body's internal environment. The levels need to be controlled so that the body can function properly, for example enzymes work at optimum temperatures/ pH levels around the body, so in order to function the internal environments must be controlled. Levels which are controlled tend to oscillate between high and low about the normal/ set point. Blood glucose levels: It is detected by the Alpha and Beta cells in the Islets of Langerhans in the Pancreas, normal levels are between 70-110 mg cm-3. This ranges due to the oscillation about the set point. When the blood glucose has been risen, this is detetced by beta cells and they become activated, they secrete insulin which inhibits the alpha cells (negative feedback) and once it has reached its target cells it acts by causing cells to take up more blood glucose from the blood and can increase metabolism so the glucose is used. Glucose can also be converted into glycogen where it is used as an energy store. All of this lowers blood glucose levels.
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