This article waslast modified on July 10, 2017.

 (also Lymph, Lymph tissue, Lymph node)

The extensive network of nodes, vessels, and ducts that collects lymph from tissues and carries it in one direction to the blood. Lymph is clear, watery fluid consisting of a number of substances including fat, protein and lymphocytes, the white blood cells that fight infections. Lymph and the lymphatic system serve to transport these substances, remove fluid and bacteria from tissues, and supply mature lymphocytes to the blood.