Monitoring Centers: The lymphatic system absorbs things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph to see if there is bacteria/viruses/ cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge/hard in response to the inflammation created when they react. Sx - pain, feeling the node.
Answered 5/2/2018
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