what does lymphatic fluid do
Â© iStockphoto.com /Eraxion. Antibodies. The lymph system is the body's drainage system. It is composed of a network of vessels and small structures called lymph nodes. The lymph vessels convey excess fluid collected from all over the body back into the blood circulation. Along the way, however, these fluids are forced to percolate through the lymph nodes so that they can be filtered.