Which of the following has the function of engulfing foreign materials?

Options

A. Marcrophages
B. Plasma cells
C. Mast cells
D. Lymphocytes

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks which type of cell has the function of engulfing foreign materials. This refers to the immune response where certain cells can consume and destroy pathogens or foreign substances.

2. **Identifying Relevant Cells**: In the context of the immune system, we focus on white blood cells (WBCs) that play a role in immunity. The main types of WBCs involved in engulfing foreign materials are:
- Polymorphonuclear leukocytes (PMNLs)
- Monocytes
- Macrophages

3. **Exploring the Function of Each Cell Type**:
- **Polymorphonuclear leukocytes (PMNLs)**: These are a type of white blood cell that can also engage in phagocytosis but are not the primary cells known for this function.
- **Monocytes**: These are the largest type of leukocytes and can differentiate into macrophages. They circulate in the bloodstream for a limited time before migrating into tissues.
- **Macrophages**: These are differentiated monocytes that have migrated into tissues. They are known for their ability to engulf and digest foreign materials through a process called phagocytosis.

4. **Conclusion**: Among the options provided, macrophages are the primary cells responsible for engulfing foreign materials. They are long-lived, highly motile, and have a strong phagocytic capability.

5. **Final Answer**: The correct answer to the question is **macrophages**.

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