Match the class of compounds given in Column I with their functions given in Column II.
| Column I | Column II |
| A. Antagonists | 1. Communicate messages 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 the body's communication process. |
| D. Receptors | 4. Mimic is the natural messenger. |
Codes
| A | B | C | D | |
| 1. | 2 | 4 | 1 | 3 |
| 2. | 3 | 1 | 4 | 2 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 3 | 2 | 1 |
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