Monitoring Centers: The lymphatic system absorbs/carries things too big to go into arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph to see if anything bad is there like bacteria, viruses, cancers, etc. When it detects a problem, it alerts the immune system and they enlarge in response to inflammation when they react. If no problem, they shrink. Biopsy for concerns.
Answered 5/23/2013
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