The lymphatic system plays a crucial role in the immune response. When the body is faced with an infection, the lymphatic system becomes highly active to help combat the pathogens. It does this by transporting lymph, a fluid that contains white blood cells, throughout the body. The lymph nodes, which are distributed along the lymphatic vessels, filter the lymph and trap bacteria, viruses, and other foreign substances. This process helps to prevent the spread of infection and facilitates the removal of waste products from the tissues. Additionally, during inflammation, the lymphatic system helps to drain excess fluid that accumulates in the tissues, thereby reducing swelling and promoting healing.