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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 are a part of the urinary system. the urinary system is one component of the excretory system of your body. The kidney is a part of the ''excretory system'' .I't regulates the chemical composition of body fluids by removing metabolic wastes and retaining the proper amounts of water, salts, and nutrients.o, the kidneys are not a part of the digestive system. The  digestive system made up of the organs in your body that process  food, absorb nutrients, and dispose of waste.