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17.3 Science Vocab.
| Term | Definition |
|---|---|
| excretion | the system in the body that collects wastes produced by cells and removes the wastes from the body. |
| urea | a chemical that comes from the breakdown of proteins. |
| kidneys | the two major organs of the excretory system that remove urea and other wastes from the blood. |
| urine | a watery fluid that contains urea and other water. |
| ureters | two narrow tubes that urine flows to from the kidneys. |
| urinary bladder | a sack-like muscular organ that stores urine. |
| urethra | small tube from which urine leaves the body. |
| nephrons | tiny filtering factors that remove wastes from blood and produce urine. |