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The kidneys contain around a million tiny filtering units called glomeruli. As blood flows through the tubes in the glomerulus at pressure, waste products pass through the walls of the tubes to form urine.

Glomerulonephritis is the term used when the glomeruli become inflamed. This means that the blood is less able to pass through the blood vessels in the glomerulus and so the kidneys cannot make as much urine as usual. The inflammation also allows blood cells and protein to pass through the blood vessel walls in the glomerulus.

More information for parents and visitors on nephritis

Watch our animation to find out more about how the kidneys work.

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