Choose incorrect statement about spleen

Options

A. Filter for blood-borne microbes
B. Primary lymphoid organ
C. Reservoir of RBC
D. Site for interaction of lymphocytes with antigens

Answer

To solve the question "Choose the incorrect statement about spleen," we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Option 1: Filter for blood-borne microbes.**
- The spleen plays a crucial role in filtering blood and removing microbes. It contains lymphocytes and fibrocytes that help in trapping these microorganisms.
- **Conclusion:** This statement is correct.

2. **Option 2: Primary lymphoid organ.**
- The spleen is often misunderstood as a primary lymphoid organ. However, it is classified as a secondary lymphoid organ. Primary lymphoid organs include the bone marrow and thymus.
- **Conclusion:** This statement is incorrect.

3. **Option 3: Reservoir of RBC.**
- The spleen does act as a reservoir for red blood cells (RBCs), although this function is somewhat limited in humans. It stores and can release RBCs into the bloodstream when needed.
- **Conclusion:** This statement is correct.

4. **Option 4: Site for interaction of lymphocytes with antigen.**
- The spleen serves as a site where lymphocytes can interact with antigens. This interaction is vital for the immune response.
- **Conclusion:** This statement is correct.

### Final Answer:
The incorrect statement about the spleen is: **"Primary lymphoid organ."**

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