The lymphatic system, for most people, is associated with the immune system to such a degree that the two systems are virtually indistinguishable. The swelling of lymph nodes during an infection and the transport of lymphocytes via the lymphatic vessels are but two examples of the many connections between these critical organ systems

The lymphatic system is the system of vessels, cells, and organs that carries excess fluids to the bloodstream and filters pathogens from the blood. A major function of the lymphatic system is to drain body fluids and return them to the bloodstream.

immune system — series of barriers, cells, and soluble mediators that combine to response to infections of the body with pathogenic organisms. lymph — fluid contained within the lymphatic system. lymphatic system — network of lymphatic vessels, lymph nodes, and ducts that carries lymph from the tissues and back to the bloodstream. lymphocytes — white blood cells characterized by a large nucleus and small rim of cytoplasm.

Be able to describe the structure and function of the lymphatic tissue (lymph fluid, vessels, ducts, and organs); describe the structure and function of the primary and secondary lymphatic organs; discuss the cells of the immune system, how they function, and their relationship with the lymphatic system.