Which term describes a substance that activates receptor to produce a biological response in opioid treatment?

• A. Agonist
• B. Buprenorphine
• C. Antagonist
• D. Alcohol use disorder

Answer: (A)

Activating a receptor to produce a biological response is the job of an agonist. An agonist binds to a receptor and triggers its signaling pathway, leading to the downstream effects the body would normally produce. In opioid treatment, this means substances that stimulate mu-opioid receptors to produce effects like analgesia and euphoria. That’s why the general term describing such a substance is agonist. Buprenorphine is a partial agonist at mu receptors, so it activates the receptor but with a ceiling effect, which is why it’s used for safety in treatment. An antagonist would block receptor activation and not produce the response, and alcohol use disorder is a condition, not a receptor-activating substance.