The document discusses various aspects of the urinary system. It defines acute renal failure (ARF) as the kidneys' inability to filter waste from the blood, end-stage renal disease (ESRD) as the complete or near complete failure of kidney function, and hemodialysis as a method to remove waste and excess water from the blood through the use of a dialysis machine when the kidneys fail. It also describes a KUB x-ray as a plain abdominal x-ray used to image the kidneys, ureters and bladder. Finally, it notes that a urinary tract infection (UTI) can occur anywhere along the urinary tract, which includes the kidneys, ureters, bladder