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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.
Circulating insulin binds to specific insulin receptors located on the cell membrane of tissue cells throughout the body. Upon binding, a signal is sent to the nucleus of the cell, instructing it to transport glucose channels to the cell surface.