Most abundant granulocytes of human blood is

Options

A. Neutrophil
B. Eosinophil
C. Basophil
D. Monocyte.

Answer

### Step-by-Step Text Solution:

1. **Understanding Blood Composition**: Human blood is composed of various types of cells, primarily red blood cells (RBCs) and white blood cells (WBCs). The WBCs are also known as leukocytes.

2. **Types of White Blood Cells**: WBCs can be categorized into two main groups: granulocytes and agranulocytes. Granulocytes contain granules in their cytoplasm, while agranulocytes do not.

3. **Identifying Granulocytes**: The main types of granulocytes include:
- Neutrophils
- Eosinophils
- Basophils

4. **Determining Abundance**: Among these granulocytes, neutrophils are the most abundant type found in human blood.

5. **Quantifying Neutrophils**: Neutrophils make up approximately 50% to 70% of the total WBC count in the human body. For instance, in 1 liter of human blood, there can be around 5 billion neutrophils.

6. **Comparing Other Granulocytes**:
- Eosinophils constitute about 1.5% of the total WBC count.
- Basophils account for only about 0.5%.
- Monocytes, which are agranulocytes, make up about 4% to 8% of the total blood volume.

7. **Conclusion**: Based on the information, the most abundant granulocyte in human blood is the neutrophil.

### Final Answer:
The most abundant granulocyte in human blood is the **neutrophil**.

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