structure that contains collecting ducts for urine
Introduction. The urinary system is comprised of the kidney, ureter, urinary bladder, and urethra. The kidney produces urine, which contains excess water, electrolytes and waste products of the body. It then flows down the ureter into the bladder where it is temporarily stored.The bladder is then emptied via the urethra.The kidney has several important homeostatic, hormonal, and metabolic functions that include:he kidney produces urine, which contains excess water, electrolytes and waste products of the body. It then flows down the ureter into the bladder where it is temporarily stored. The bladder is then emptied via the urethra. The kidney has several important homeostatic, hormonal, and metabolic functions that include: