Which of the following chemical is a not released by the mast cells during allergic reactions

Options

A. Adrenalin
B. Histamine
C. Serotonin
D. 2 and 3

Answer

To determine which chemical is not released by mast cells during allergic reactions, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Mast Cells and Their Function**:
- Mast cells are a type of white blood cell that play a crucial role in the immune response, particularly during allergic reactions. They release various chemicals that mediate inflammation and allergic responses.

2. **Identify Common Chemicals Released by Mast Cells**:
- The primary chemicals released by mast cells during allergic reactions include histamine and serotonin. Histamine is well-known for its role in causing symptoms like itching, swelling, and redness during allergies.

3. **Examine the Options Given**:
- The question provides a list of chemicals, including histamine, serotonin, and adrenaline. We need to identify which of these is not released by mast cells.

4. **Analyze Each Chemical**:
- **Histamine**: Released by mast cells during allergic reactions.
- **Serotonin**: Also released by mast cells during allergic reactions.
- **Adrenaline**: This is a hormone produced by the adrenal glands, not by mast cells.

5. **Conclusion**:
- Since adrenaline is not released by mast cells, it is the correct answer to the question.

### Final Answer:
**Adrenaline** is the chemical that is not released by mast cells during allergic reactions.

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