The lymphatic system is comprised of the lymph, lymph vessels, lymph nodes, bone marrow, spleen, and liver. The lymph is the fluid that circulates in the lymphatic system and travels through the body via lymph vessels. The fluid contains lymphocytes - produced by the bone marrow and spleen -that fight pathogens. These cells filter the blood and collect the microorganisms inside lymph nodes. You'll notice that during infections, you will have a palpable node in your neck, under your arms, breasts, and groin. When the pathogens are overwhelmed, toxins and byproducts produced by these cells are then filtered in the liver to be eliminated.