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Usually, receptors are proteins found on or within the membrane. Many different types of molecules can bind to receptors on the cell surface, including hormones. An insulin receptor is an example of a receptor that binds to a hormones, specifically insulin.
The pancreas then secretes insulin in response to the increase in blood sugar. Most cells of the body have insulin receptors which bind the insulin to the cell. When a cell has insulin attached to it, the cell then is able to activate the other receptors.