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Inside the body, the immune system is made up of an 'army' of special cells. These defenders each have different functions and are located in different areas of the body. For instance, some do their work in the bloodstream, tonsils, appendix and spleen, while others work in the gut and lymph nodes. For the purposes of this article, we are going to look at the specific role of the lymphatic system in supporting immunity. What is the lymphatic system? The lymphatic system is made up of: Lymphocytes: These are a form of small white blood cell that determine the type of immune response to infectious microorganisms and other foreign substances that enter the body. Lymph: This is a clear fluid, which bathes the tissues and carries immune cells (such as B and T lymphocytes). The lymphatic system collects excess fluids, nutrients, gases, ions, hormones, enzymes and plasma proteins from surrounding tissues and returns them to the blood circulation, once pathogens, toxins and waste ...