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6. Lymph Nodes

There are over 500 lymph nodes in the human body. They all contain a number of lymphocytes, many of which are T cells and B cells. The lymph passing through the lymph nodes carries waste materials and requires cleaning. When the lymph enters a node, it passes through white blood cells called macrophages, which trap the waste materials. The clean lymph and chyle then travel through a large vein to merge with the bloodstream.

lymph lymphatic system

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