5 describe the feedback loop responsible for

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to them, and clearer vision when looking at objects in the distance. 5. Describe the feedback loop responsible for regulating blood glucose levels. What illness results if this system no longer functions properly? Cells need a stable environment to survive. Homeostasis is the mechanism that allows living organisms to maintain relatively constant levels of temperature, pH, ions and water balance. These mechanisms are controlled by processes known as negative feedback, in which the system responds to environmental changes by releasing molecules, such as hormones, to exert an effect on the body that will reverse a high or low trend and restore levels to within the normal range. Cells derive their energy from glucose, and it is vital that glucose levels be tightly regulated. Too much glucose is toxic to cells while too little glucose leads to starvation. Blood glucose levels can fluctuate for a number of reasons, such as digestion after a meal and production of insulin by the liver, both of which lead to increased glucose levels, or from the transport of sugar into the cells and the loss of glucose in the urine, which lower blood glucose levels.
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