A doctor discovers a new drug that has a similar shape to endorphins, which are natural chemicals that relieve pain. If this new drug works in the same way as endorphins, we would refer to it as a(n) _______________.

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An agonist is a substance that activates a receptor to produce a biological response, similar to how endorphins activate their receptors to relieve pain. Since the new drug mimics endorphins, it would also be considered an agonist.

A Doctor Discovers a New Drug That Has a Similar