Which of the following are phagocytic in nature ?

Options

A. Monocytes
B. Macrophages
C. Neutrophils
D. All of these

Answer

To determine which of the following cells are phagocytic in nature, we need to analyze each option provided: monocytes, macrophages, and neutrophils.

### Step-by-Step Solution:

1. **Understanding Phagocytosis**:
- Phagocytosis is the process by which certain cells, known as phagocytes, engulf and digest harmful pathogens or damaged cells. These cells play a crucial role in the immune response.

2. **Analyzing Monocytes**:
- Monocytes are a type of white blood cell (leukocyte). They are known to be phagocytic, meaning they can engulf and remove pathogens from the body. Additionally, monocytes can differentiate into macrophages, which are also phagocytic.

3. **Analyzing Macrophages**:
- Macrophages are derived from monocytes and are well-known phagocytic cells. They are larger and more effective at engulfing pathogens and debris than monocytes. Therefore, macrophages are also phagocytic in nature.

4. **Analyzing Neutrophils**:
- Neutrophils are another type of white blood cell and constitute a significant portion of the immune response (50-60% of WBCs). They are the first responders to bacterial infections and are also phagocytic, actively engulfing bacteria and other pathogens.

5. **Conclusion**:
- Since all three types of cells—monocytes, macrophages, and neutrophils—are phagocytic in nature, the correct answer is that all of these options are phagocytic.

### Final Answer:
**D) All of these**