The body's plumbing

How your kidneys, ureters and bladder filter around 180 litres of fluid a day and keep only what you need.

6 minutes · 6 stops · Supporter tour

1. Filters on your back wall

   Your two kidneys sit high at the back of your abdomen. Each contains about a million tiny filters that clean your blood, removing waste and extra water while keeping the salts and sugar you need.

2. A huge blood supply
3. Tubes that squeeze
4. A stretchy store
5. The muscles that hold on
6. Hormones on top

Start the tour in the 3D atlas