Understanding the Anatomy and Function of Lymph Nodes

9. Immune System

The lymph nodes’ most important function is filtering lymph to identify and then combat incoming infections. Lymphocytes circulate through the bloodstream before residing in the lymph nodes. Once B cells arrive in the lymph nodes, they produce antibodies that each target a single antigen. When they bind to these antigens, they stimulate an immune response. In some cases, this allows for the creation of plasma cells or memory cells that allow the body to fight future infections.