Lymphocytes are the lymp nodes is your lymphatic system. This sytem is the "waste" system of the body for when you are sick. It picks up and carries antigens, and etc to you lymphs, which is why they get swollen when you are sick. ----------------------------------------------- Do not confuse lymphatics with lymphoid organs. Lymphatics is part of the lymphatic system and lymphoid organs are part of the lymphatic system and the immune system, with lymphocytes being the immune part. Lymphatics is a network of vessels (like blood vessels) that maintain fluid balance in body tissues by draining excess fluid and returning it to the blood. Lymphatics is also responsible for fat absorption in the intestines. The lymphoid organs such as bone marrow, thymus and lymph nodes are drained by lymphatic vessels just like any other organ but they also have the special role of containing lymphoid cells, which are immune cells that reside in the lymphatic system. These lymphoid organs are specifically structured in a way to maximize detection of foreign particles that have been drained from body tissues.