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urinary system an organ system that helps excrete wastes from the body kidney a bean-shaped organ that filters wastes from the blood and produces urine urine a waste substance made in the kidneys that contains mostly water and small amounts of urea ureter a tube that delivers urine made in the kidney to the bladder bladder a stretchy organ that holds urine until you are ready to excrete it urethra a tube that delivers urine from the bladder to outside the body nephron a tiny microscopic filtering unit inside the kidney urinary tract infection an infection in the kidneys, bladder, or ureters, caused by bacteria, that makes it difficult and painful to urinate kidney stones a disorder caused by build up of minerals that form stones that get stuck in the ureters, making it difficult and painful to urinate dialysis a treatment for people with kidney disease where blood is filtered through a machine sphincter regulates the flow of urine pituitary gland it releases ADH and is located in the brain. It regulates the water content of urine Bowman's capsule it encloses a bundle of tiny capillaries called the glomerulus. liver a chemical factory that does more than 500 different jobs. It also helps in the removal of wastes and poisons from the blood. renal vein It is through this vein that blood exits from the kidney. urologists kidney doctors