text: The lymphatic system is a circulatory system that uses the large muscles (those that move your body) to pump white cells - lymphocytes, macrophages, PMNs, etc - around to fight disease. These move through lymph ducts, nodes, and selected lymphatic organs (thymus, bone marrow, etc).\n\nWhat you normally think of as the circulatory system consists of the heart as the pump, arteries, capillaries, veins. It has red cells for oxygen transport but also white cells for fighting disease.\n\nThe bone marrow is the factory that produces all of the prototypes of these cells.