The kidneys act as filters to clean the blood. They get rid of waste and extra fluid. The tiny filters throughout the kidneys are called glomeruli (glo-MEHR-yoo-lie).
When kidneys are healthy, the artery (AR-ter-ee) brings blood and waste from the bloodstream into the kidney. The glomeruli clean the blood. Then waste and extra fluid go out into the urine through the ureter. Clean blood goes out of the kidney and back into the bloodstream through the vein.
You have two kidneys. Your kidneys clean your blood and make urine. This is a simplified drawing of one.
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Sources:
National Institutes of Health
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