Which organ is primarily involved in filtering lymph fluid?

The spleen is the organ primarily involved in filtering lymph fluid. It plays a crucial role in the immune system by monitoring the blood for foreign antigens and pathogens. The spleen contains white blood cells, such as lymphocytes and macrophages, that help identify and respond to infections and other threats. Additionally, it removes old or damaged red blood cells from circulation, which is an important aspect of maintaining blood health and ensuring appropriate immune response.

While the liver, thymus, and bone marrow have important functions in the body, they do not filter lymph fluid in the same way the spleen does. The liver deals with detoxification and metabolism, the thymus is essential for the maturation of T-cells (a type of immune cell), and the bone marrow produces various blood cells, including red blood cells and immune cells. Each of these organs plays a role in the immune system but does not directly filter lymph fluid as effectively as the spleen.