Which leucocytes release histamine , serotonin and heparin ?

Options

A. Eosinophils
B. Basophils
C. Monocytes
D. Neutrophils.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks which type of leukocytes (white blood cells) release histamine, serotonin, and heparin.

2. **Identifying the Molecules:**
- **Histamine:** A compound involved in local immune responses and inflammation.
- **Serotonin:** A neurotransmitter that also plays a role in the immune response and can induce inflammation.
- **Heparin:** An anticoagulant that prevents blood clotting.

3. **Reviewing the Types of Leukocytes:**
The options provided are:
- Eosinophils
- Basophils
- Monocytes
- Neutrophils

4. **Analyzing Each Type of Leukocyte:**
- **Eosinophils:** Primarily involved in combating parasitic infections and allergic reactions. They do not release histamine, serotonin, or heparin.
- **Basophils:** These are granulocytes that release histamine and serotonin, and they also release heparin. They play a crucial role in inflammatory responses and allergic reactions.
- **Monocytes:** These cells are involved in phagocytosis and do not release the mentioned molecules.
- **Neutrophils:** These are also phagocytic cells and do not release histamine, serotonin, or heparin.

5. **Conclusion:**
Based on the analysis, the leukocyte that releases histamine, serotonin, and heparin is **Basophils**.

**Final Answer: Basophils**

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