| A | B |
|---|
| Excretion | The removal of waste products. |
| Urea | A chemical produced by the breakdown of proteins. |
| Kidney | Two organs that remove urea and other wastes from the blood. |
| Urine | A watery fluid that contains urea and other wastes. |
| Ureter | Two narrow tubes through which urine flows from the kidneys to the bladder. |
| Urinary Blader | A sack-like muscular organ that stores urine. |
| Urethra | A small tube through which the urine leaves the body. |
| Nephron | Tiny filtering factories that remove wastes from blood and produces urine. |
