What do you call the type of drugs that mimic the natural messenger by switching on the receptor?

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**Solution:**

1. An **agonist** is a drug or substance that binds to a receptor and **activates it**, producing a biological response similar to the natural messenger (such as a neurotransmitter or hormone).

2. **Antagonists** also bind to receptors but **block** the receptor, preventing the natural messenger from activating it, thus inhibiting the biological response.

3. **Antidepressants** and **depressants** are broad categories of drugs that affect mood or nervous system activity but are not specifically defined by receptor activation or blocking.

**Answer:** Agonist

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