The lymphatic system is over of the least talked about complete systems in the body. It's like those illustrations of the circulatory systems and the nervous systems and then years later biology teachers are like 'oh, yeah, there's another one too' and then right back to floating over it.

Seems like it's that way because it was so elusive anatomically and low key for the most part, but just like hormones are crazy important to how we work, the lymphatic system is crazy important to how things keep working. I think most people, if they even think about it, assume everything flows back directly into the circulatory system, but aside from gasses, that seems like mostly an outbound channel.