DESCRIPTION
Your kidneys are major organs of the body. Most people are born with two kidneys, each about the size of a fist, weighing about 150 grams. They are bean-shaped organs located near the middle of your back, just under the ribcage. The kidneys do many jobs. They filter waste from blood, remove extra water from the body, keep the proper balance of salts and acids in the body and produce hormones. To remove waste and extra water, blood enters the kidney through the renal artery. Blood is cleaned in the kidney as it passes through tiny filters called nephrons. One kidney contains about one million nephrons. Cleaned blood returns to the body by the renal vein. Waste and extra water removed by the kidney passes through a tube called the ureter to the bladder where it is stored as urine or wee. When the bladder is full, the urine passes out of the body through another tube called the urethra.