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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.
1 Ion channel-linked receptors bind a ligand and open a channel through the membrane that allows specific ions to pass through.  G-protein-linked receptors bind a ligand and activate a membrane protein called a G-protein, which then interacts with either an ion channel or an enzyme in the membrane.