Insulin is secreted from the pancreatic islets of Langerhans in response to elevated levels of glucose in the blood plasma. The effect of insulin is to stimulate cells to take up glucose (out of the plasma), resulting in decreased plasma glucose levels. This system is an example of the physiological principle of

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The system described is an example of homeostasis, which is the body's ability to maintain a stable internal environment (such as blood glucose levels) in response to changes in external conditions.

Insulin Is Secreted from the Pancreatic Islets of Langerhans in Response