1. The filtering units in the kidneys are called nephrons
2. The renal artery brings unfiltered blood into the kidney. It divides to form a network of blood capillaries called a glomerulus. These sit inside part of the nephron called the bowmans capsule.
3. Small molecules are filtered out of the blood into the nephron. This is called the glomerular filtrate.
4. Filtrated blood flows close to the nephron.
5. Useful substances are re-absorbed back into the blood from the tubule.
6. This purified blood is then transported to the renal vein leaving the kidney.
7. Urine, containing urea and excess water flows to the collecting duct and down the ureter to the bladder where it is stored before release.