Deep in your kidney, tiny balls of blood vessels filter your blood. Flat cells build a cup around each one to catch the fluid.
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Your kidneys are full of tiny filters. Each filter is a little ball of blood vessels called a glomerulus.
Around each ball is a hollow cup, a bit like a ball sitting in a catcher's mitt. Parietal cells make the outer wall of that cup.
They are very flat, thin cells, laid side by side like tiles.
Each kidney has about a million of these tiny filters, and each one has its own cup!
Blood gets squeezed through the ball of blood vessels. Water, salt, and other small things leak out. Blood cells stay in.
Press Filter the blood on the 3D model and watch fluid flow out of the cup.
By Operation Ouch. A fun video for kids.
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