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( Lymph node)
Lymph nodes (IPA&_160;[ l?mf no?dz, l?mf n??dz], are components of the lymphatic system. They are found throughout the body. Lymph nodes act as filters or traps for foreign particles and contain white blood cells. Nodes act as filters, with an internal honeycomb of reticular connective tissue filled with lymphocytes that collect and destroy bacteria and viruses. When the body is fighting an infection, lymphocytes multiply rapidly and produce a characteristic swelling of the lymph nodes. Lymphatic fluid in the tissues, before it has gone into a lymph node, is called interstitial fluid. The lymph node is surrounded by a fibrous capsule, and inside the lymph node the fibrous capsule extends to form trabeculae. Thin reticular fibers form a supporting meshwork inside the node. The concave side of the lymph node is called the hilum. The artery and vein attach at the hilum and allow blood to enter and leave the organ, respectively.
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