The lymphatic system comes up a lot in things related to cancer. It never showed up in high school biology or textbooks. I know that it involves the fluid known as ‘lymph’ but I don’t really understand what lymph is even after researching it.
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The ELI5 is that it’s because the circulatory system is complex and the immune system is even more complex. You’d need courses in both before actually understanding what the lymph system is doing. Of course unless you’re satisfied with “the lymph system is an important part of the immune system, involving parts where immune cells are trained and proliferated”.
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