Which term describes molecules that bind to a receptor and trigger a response?

Which term describes molecules that bind to a receptor and trigger a response?

• A. Delirium
• B. Ectopic Pregnancy
• C. Mittelschmerz
• D. Agonist

Answer: (D)

When a molecule binds to a receptor and triggers a cellular response, it’s called an agonist. Agonists have affinity for the receptor (they bind) and efficacy (they activate the receptor to produce a effect). Endogenous substances like natural hormones and neurotransmitters act as agonists, and drugs can be designed to mimic that activation. A full agonist elicits the maximal possible response, while a partial agonist yields a smaller response even when all receptors are occupied. The other terms describe unrelated medical conditions (delirium, ectopic pregnancy, mittelschmerz) and do not pertain to receptor activation.

When a molecule binds to a receptor and triggers a cellular response, it’s called an agonist. Agonists have affinity for the receptor (they bind) and efficacy (they activate the receptor to produce a effect). Endogenous substances like natural hormones and neurotransmitters act as agonists, and drugs can be designed to mimic that activation. A full agonist elicits the maximal possible response, while a partial agonist yields a smaller response even when all receptors are occupied.

The other terms describe unrelated medical conditions (delirium, ectopic pregnancy, mittelschmerz) and do not pertain to receptor activation.