| Term | Definition |
|---|
| the excretory system | the system in the body that collects wastesproduced by cells and removes the water from the body |
| excretion | the process by wich wastes are removed from the body |
| urea | a chemical that comes from the breakdown of proteins |
| kidneys | the major organs of the exretory system ----- eliminate urea excess water and some other waste materials |
| ureters | two narrow tubes through which urine flows from the kidneys |
| urinary bladder | a sacklike muscular organ that stores urine |
| nephrons | tiny filtering factories |
| first stage | both wastes and needed materials such as glucose are romoves from the blood |
| second stage | much of the neede materials is returned to the blood |
| organs of excretion | lungs skin liver and kidneys |
| urine | a watery fluid produced by the kidneys that contains urea and other waste materials |
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