What is the primary purpose of the lymphatic system's filtration function?

The primary purpose of the lymphatic system's filtration function is to defend against infections. The lymphatic system plays a crucial role in the immune response by filtering lymph, which is the fluid that circulates throughout the lymphatic vessels. During this filtration process, the lymph is cleared of pathogens, debris, and abnormal cells, which helps to prevent infections and maintain the overall health of the body.

This filtration occurs primarily in the lymph nodes, where immune cells, such as lymphocytes and macrophages, are concentrated. These immune cells recognize and respond to foreign invaders, such as bacteria and viruses, by mounting an immune response to eliminate them. Thus, the defense against infections is a vital function that underscores the importance of the lymphatic system in the body’s overall immune defense mechanism.