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When the bladder is about halfway full, your body tells you to go to the bathroom. When you pee, the urine goes from the bladder down another tube called the urethra (say: yu-REE-thruh) and out of your body. The kidneys, the bladder, and their tubes are called the urinary system. Here's a list of all of the parts of the urinary system: 1  the kidneys: filters that take the waste out of the blood and make urine.  the ureters: tubes that carry the urine from each kidney to the bladder.
The kidneys ensure that the make-up and volume of the fluids in the body is correct. They help control the chemical balance of the blood and regulate the bodyâs level of sodium, potassium and calcium. The kidneys remove waste products and excess water from the body and so help to regulate blood pressure.They activate vitamin D, which helps to maintain strong bones, and produce erythropoietin, a hormone that is vital for the production of red blood cells.Each kidney contains 1.0-1.5 million small tubes called nephrons. The kidneys filter blood through a network of small blood vessels called the glomerulus.he kidneys ensure that the make-up and volume of the fluids in the body is correct. They help control the chemical balance of the blood and regulate the bodyâs level of sodium, potassium and calcium. The kidneys remove waste products and excess water from the body and so help to regulate blood pressure.