- Extract waste products and toxins from bodily fluids and blood
- Removes harmful nitrogenous wastes that are produced during the process of metabolism in the body
- Excrete excess water and other waste products in the form of urine
- Plays a role in the reproductive system because the urinary tract acts as a passage for eggs and sperm
The attached chart shows the organs of the urinary system in the order in which urine passes through them:
Each day the kidneys receive almost 200 quarts of blood needing to be filtered form the chemicals it contains. When this blood enters the kidney, it is filtered in the millions of nephrons. Within these nephrons are capillaries carrying blood and tubules that exchange chemicals with the blood and carry the urine. This process is complex because the kidneys must be sure to keep all of the chemicals and the pH balanced while still removing wastes and toxins from the bloodstream. These nephrons collect the components to form urine and then expel this urine into the ureters to remove the waste products from the body and it releases the purified blood back into the bloodstream. This process continues continually as waste builds up in the blood from normal bodily functions and the various things we consume.