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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.
I will give you a very short explanation. The digestive system controls what nutrients and minerals get into your blood supply, and it is directly connected to your circulatory system. The same circulatory system supplies the digestive system itself with blood to function. Also the digestive system, which ends with the colon->rectum is part of the excretory system. The kidneys are also part of excretory system and they receive the blood which they clean from the circulatory system. The lungs (part of the respiratory system) are the first organ to receive blood directly from the heart (which is the pump of the circulatory system).