One of the main functions of the lymphatic system is to filter blood. How exactly is it done? Its quite hard to find an exact answer.
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The spleen is an integral part of the lymphatic system, and it is a major filter of blood.
The way this is done is by removing old, distorted, or antibody-coated red blood cells from circulation.
Interestingly, the spleen is enlarged with many leukemias and lymphomas.