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feedback helps to maintain stability in the body's internal environment and ensures that physiological processes operate within a narrow range of values. An example of this is the negative feedback loop of insulin and glucagon in the body. When blood sugar increases, the pancreas secretes more insulin to increase uptake and utilisation of glucose by the body cells and inhibits breakdown of glycogen to glucose by the liver. when blood sugar levels decrease, the pancreas secretes glucagon which stimulates breakdown of glycogen into glucose and promotes production of glucose by the liver, which increases blood glucose levels.
Thus, insulin and glucagon work together in a feedback mechanism to maintain blood glucose homeostasis. When blood glucose levels rise, insulin is secreted to lower them, and when blood glucose levels fall, glucagon is secreted to raise them.