An _____ is a drug or other chemical that blocks a receptor site and inhibits or prevents a response in the receiving cell.
A) antagonist
B) endorphin
C) agonist
D) opiate

Question

Quizplus · Accepted Answer

An antagonist is a drug or chemical that blocks or inhibits a response in the receiving cell by binding to the receptor site without activating it. This is in contrast to an agonist, which activates a receptor site, and endorphins and opiates are types of agonists.

An _____ Is a Drug or Other Chemical That Blocks