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Urine and Urination

URL of this page: http://www.nlm.nih.gov/medlineplus/urineandurination.html

Your kidneys form urine by filtering wastes and extra water from the bloodstream. The waste is called urea. It is carried in the bloodstream to the kidneys. From the kidneys, urine travels down two thin tubes called ureters to the bladder. The bladder stores urine until you are ready to go to the bathroom. It swells into a round shape when it is full and gets smaller when empty. If your urinary system is healthy, your bladder can hold up to 16 ounces (2 cups) of urine comfortably for 2 to 5 hours.
You may have problems with urination if you have

Kidney failure
Urinary tract infections
Prostate enlargement
Bladder control problems like incontinence or interstitial cystitis
A blockage that prevents you from emptying your bladder

Some conditions may also cause you to have blood or protein to be in your urine. If you have a urinary problem, see your healthcare provider. Treatment depends on the cause.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

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Urine and Urination: MedlinePlus