Component	Function
Kidneys	Filter wastes and excess material from the blood Help regulate blood pressure and pH Maintain fluid balance by regulating the volume and composition of blood and urine Release erythropoietin, which stimulates production of red blood cells Transform vitamin D into its active form
Ureters	Transport urine from kidneys to urinary bladder
Urinary bladder	Stores urine Contracts and expels urine to urethra
Urethra	Transports urine from urinary bladder to outside the body In males, transports semen to outside the body