Filtration of lymphatic fluid occurs primarily in the:

• A. thymus
• B. lymph nodes
• C. spleen
• D. bone marrow

Answer: (B)

Verified step by step guidance

1. Understand the function of lymphatic fluid: Lymphatic fluid is a clear fluid that circulates through the lymphatic system, carrying immune cells and waste products. Filtration of this fluid is essential for removing pathogens and debris.
2. Review the role of lymph nodes: Lymph nodes are small, bean-shaped structures located throughout the body. They act as filters for lymphatic fluid, trapping pathogens, debris, and cancer cells while housing immune cells that help fight infections.
3. Compare the roles of other organs listed: The thymus is involved in the maturation of T-cells, the spleen filters blood and removes old red blood cells, and the bone marrow produces blood cells. None of these structures are primarily responsible for filtering lymphatic fluid.
4. Identify the correct answer based on function: Since lymph nodes are specialized for filtering lymphatic fluid, they are the primary site for this process.
5. Conclude that lymph nodes are the correct answer and explain why: Lymph nodes are strategically located throughout the body to ensure efficient filtration of lymphatic fluid, making them the primary site for this function.