Which term describes a drug that binds to receptors and mimics endogenous compounds?

Which term describes a drug that binds to receptors and mimics endogenous compounds?

• A. Agonist
• B. Antagonist
• C. Partial agonist
• D. Inverse agonist

Answer: (A)

When a drug binds to a receptor and activates it to produce the same type of response as the body’s own signaling molecule, that drug is an agonist. This means it has affinity for the receptor and efficacy, triggering a biological effect similar to endogenous ligands. Full agonists yield the maximal response when receptors are occupied, while partial agonists activate but produce only a partial effect. Antagonists bind without activating, blocking endogenous ligands, and inverse agonists reduce baseline receptor activity. The description in the question fits activation and mimicry of the body's own signaling, which is the defining feature of an agonist.

When a drug binds to a receptor and activates it to produce the same type of response as the body’s own signaling molecule, that drug is an agonist. This means it has affinity for the receptor and efficacy, triggering a biological effect similar to endogenous ligands. Full agonists yield the maximal response when receptors are occupied, while partial agonists activate but produce only a partial effect. Antagonists bind without activating, blocking endogenous ligands, and inverse agonists reduce baseline receptor activity. The description in the question fits activation and mimicry of the body's own signaling, which is the defining feature of an agonist.