Matching Pairs Excretory System MatchOnline version Test your knowledge of the human excretory system with this matching pairs game! by Rachel Jackson 1 Urethra 2 Urine 3 Sweat 4 Liver 5 Sphincter 6 Bladder 7 Kidneys 8 Ureters 9 Urinary System 10 Nephron 11 Skin 12 Excretion Functional unit of the kidney Liquid waste excreted by the kidneys Processes waste products from cell metabolism into safer substances Muscle that controls the release of urine Process of removing wastes from the body Stores urine Largest organ in the human body Transport urine from kidneys to bladder Carries urine from bladder to outside the body Filter waste from blood Eliminates waste from the body Salty waste excreted by the skin