Problem: Receptors are the component of a cell or organism that interacts with a drug and initiates the chain of events leading to the drug's effects. The receptor site for a drug is the specific binding region of the receptor macromolecule and has a relatively high and selective affinity for the drug molecule. The interaction of a drug with its receptor is the fundamental event that initiates the action of the drug. Many drugs are classified based on their primary receptor affinity. Which of the following types of receptors are utilized by alpha and beta adrenergic receptors? Need Assignment Help? Gated Ion Channels Intracellular receptors G-protein-coupled receptors Enzyme-linked receptors