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The primary function of all lymph nodes is the production of lymphocytes, which help defend the body against microorganisms and against harmful foreign particles and debris from lymph before it is returned to the blood stream.The major clusters of lymph nodes are in six areas.Those areas are: (1) ...he primary function of all lymph nodes is the production of lymphocytes, which help defend the body against microorganisms and against harmful foreign particles and debris from lymph before it is returned to the blood stream.
Lymph nodes are tiny organs that appear throughout the body and function as part of the lymphatic system. The lymphatic system is an extension of the immune system. Lymph nodes filter a fluid called lymph, trapping bacteria and other harmful substances. Because of their function, they often become swollen during an infection. Lymph nodes are found in the neck, armpits, chest, abdomen and groin.