The lymphatic system is a complex network of tubes (lymphatic vessels), glands (or lymph nodes) and other organs such as the spleen. We have lymph nodes and vessels throughout our bodies. These are often found in groups, particularly under the arms, in the neck and in the groin.
The lymphatic system is part of the body's natural defence against infection - the 'immune system'. The vessels and glands hold a clear fluid called lymph. Lymph contains white blood cells, called lymphocytes, which the body uses to fight infection. Lymphocytes are mainly found in the lymph nodes but circulate around the body in both the blood and lymphatic system.
The lymphatic system also has a number of other functions. It drains waste products and excess fluid from different parts of the body, and moves them to the blood stream to be processed. It also conveys nutrients and cells.
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