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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 urinary system eliminates wastes, controls blood volume, regulates blood ion concentration and pH, and regulates red blood cell production. Functions of the Urinary System The kidneys excrete waste products. The kidneys control blood volume by regulating the volume of urine produced. The kidneys help regulate the concentration of major ions in the body fluids. The kidneys help regulate pH of the body fluids. The kidneys regulate the concentration of erythrocytes in the blood. The kidneys participate, with the skin and liver, in vitamin D synthesis. Urinary System Kidneys Each kidney is behind the peritoneum and surrounded by a renal capsule and a renal fat pad.