The lymphatic system is central to the body's defense and immunity. A network of lymphatic vessels run throughout the body and collect the watery lymph fluid which drains from blood and from between cells (interstitial fluid).Lymphatic vessels have larger pores than capillaries so that they can exchange large molecules such as proteins, fragments of damaged tissue and micro-organisms.
Lymph nodes, which contain certain leukocytes, are found throughout the lymphatic system and serve to filter lymph of waste materials and dangerous substances before the fluid is returned to the blood stream.
Lymphocytes, a type of leukocyte, are formed within the lymphatic system.
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