(c) kidney → ureter → bladder → urethra
During blood circulation, blood passes through the kidneys. This blood contains both useful and waste materials. The kidneys filter the wastes from the blood and produce urine. From the kidneys, the urine goes into the urinary bladder through two narrow tubes called ureters. The urinary bladder stores the urine until it is forced out of the body, through an opening known as the urethra.