After the bottom of the kidney's U-shaped loop, the fluid starts back up. Here, thin cells let salt out but keep water in.
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The kidney's U-shaped loop of Henle goes down deep, turns, and comes back up.
Just after the turn, the uphill side is lined with thin, flat cells. They look almost the same as the cells on the downhill side.
They look like twins of the downhill cells, but they do the opposite! Downhill cells let water out. These cells keep water in.
Teamwork like this lets your kidneys save water when you need it.
Press Let salt out on the 3D model.
By Operation Ouch. A fun video for kids.
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