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The lymphatic system maintains fluid levels in the body. Bacteria and other microbes are taken up by the lymph and delivered to the lymph nodes for destruction. The spleen and thymus are organs that filter the blood. 1  The lymphatic system is a network of tubes throughout the body that drains fluid (called lymph) from tissues and empties it back into the bloodstream. The main roles of the lymphatic system include managing the fluid levels in the body, filtering out bacteria, and housing types of white blood cells.
What the lymphatic system is. The lymphatic system is a system of thin tubes and lymph nodes that run throughout the body. These tubes are called lymph vessels or lymphatic vessels. The lymph system is an important part of our immune system.It plays a role in fighting bacteria and other infections and destroying old or abnormal cells, such as cancer cells.rom the lymph glands, the lymph moves into larger lymphatic vessels that join up. These eventually reach a very large lymph vessel at the base of the neck called the thoracic duct. The thoracic duct then empties the lymph back into the blood circulation.