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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 also help control the levels of water and various essential minerals in the body. In addition, theyâre critical to the production of: vitamin D; red blood cells; hormones that regulate blood pressure; If your doctor thinks your kidneys may not be working properly, you may need kidney function tests. These are simple blood and urine tests that can identify problems with your kidneys. You may also need kidney function testing done if you have other conditions that can harm the kidneys, such as diabetes or high blood pressure.