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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.
Hormone-receptor binding triggers the target cell to do what its supposed to. The extent of target cell activation is affected by: levels of hormone in the blood, the amount of receptors for that hormone, and the affinity of the receptor for the hormone.