The lymphatic system is composed of a dense
network of conduits that carry the interstitial
fluid (the fluid that our bodies cells are
suspended in) throughout the body. It plays roles
in cycling this fluid and in fatty acid transport,
but by far the most studied is its role in our
immune system. The lymphatic system produces and
helps distribute lymphocytes, immune system cells
that recognize and kill invading antigens, like
bacteria and viruses.
Wikipedia has a good
introduction to the lymphatic system and its
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