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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.
One of the most-important functions of the lymphatic system is to aid the immune system. It does this by destroying harmful organisms and filtering waste through the lymph fluid. After the organisms are filtered, the lymph is returned to the circulatory system.