The Urinary system's function consists of two kidneys two ureters leading down to the bladder and the urethra leading to the external body. The function of the kidneys is to filter the blood through tiny specialised structures known as nephrons. These are very delicate structures than can be damaged through continuous high blood pressure. The kidneys regulate electrolytes (salts) within the body and remove waste such as urea, they also help regulate blood pressure. They excrete this waste as urine. Incidentally urine is sterile until it leaves the body when bacteria acts upon it. The urine then passes down the ureters to the bladder where it is stored until its convent to be emptied. They are placed at the rear of the abdominal cavity and are protected by an area of fat just below the waist.
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