What does the urinary system control?
The Urinary System extracts waste from your body. The organs,
tubes, muscles, and nerves that work together to create, store, and
carry urine are the urinary system. The urinary system includes two
kidneys, two ureters, the bladder, two sphincter muscles, and the
urethra.
http://kidney.niddk.nih.gov/kudiseases/pubs/Yoururinary/