| Column-$I$ | Column-$II$ |
| $A$. Antagonists | $1$. Communicate message between two neurons and that between neurons to muscles |
| $B$. Agonists | $2$. Bind to the receptor site and inhibit its natural function |
| $C$. Chemical messenger | $3$. Crucial to body's communication process |
| $D$. Inhibitors | $4$. Mimic the natural messenger |
| $E$. Receptors | $5$. Inhibit activities of enzymes |
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