Types of drugs that mimic that natural messenger by switching on the receptor are called

Options

A. antagonists
B. chemical messengers
C. receptors
D. agonists

Answer

To answer the question, we need to identify the type of drugs that mimic natural messengers by activating receptors. Here’s the step-by-step solution:

### Step 1: Understand the Question
The question asks about a specific type of drug that mimics natural messengers and activates receptors.

**Hint:** Focus on the relationship between drugs and receptors in the context of natural messengers.

### Step 2: Define Natural Messengers
Natural messengers are substances in the body, such as hormones or neurotransmitters, that bind to receptors to elicit a biological response.

**Hint:** Consider examples of natural messengers like adrenaline or serotonin.

### Step 3: Identify Drug Types
Drugs can interact with receptors in different ways. They can either activate receptors or block them. The types of drugs that activate receptors are known as agonists.

**Hint:** Think about the terms "activate" and "block" in relation to receptor activity.

### Step 4: Define Agonists
Agonists are drugs that bind to receptors and activate them, mimicking the action of natural messengers. They essentially "switch on" the receptor.

**Hint:** Remember that agonists have a similar effect to the natural messenger they mimic.

### Step 5: Conclusion
Based on the definitions and understanding, the types of drugs that mimic natural messengers by switching on the receptors are called **agonists**.

**Final Answer:** Agonists