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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.
Renal function, or kidney function, is a measure of how well the kidneys are filtering blood. If you have two fully-functioning kidneys, you have all of your renal function (100 percent). A majority of kidney diseases damage renal function by attacking little filtration units in the kidneys, called nephrons.enal function, or kidney function, is a measure of how well the kidneys are filtering blood. If you have two fully-functioning kidneys, you have all of your renal function (100 percent). A majority of kidney diseases damage renal function by attacking little filtration units in the kidneys, called nephrons.