Lymph nodes have two primary functions: filtering potentially harmful particles from lymph before returning it to the bloodstream and monitoring the body fluids (immune surveillance), provided by lymphocytes and macrophages. Along with the red bone marrow, the lymph nodes are centers for lymphocyte production. These cells attack invading viruses, bacteria, and other parasitic cells that lymphatic vessels bring to the nodes. Macrophages in the nodes engulf and destroy foreign substances, damaged cells, and cellular debris.
H Distinguish between a lymph node and a lymph nodule.
^9 What factors promote the flow of lymph through a node?
^9 In what body regions are lymph nodes most abundant? D What are the major functions of lymph nodes?
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