Healthy humans have two kidneys, although only one is necessary. The kidneys' primary function is to rid the body of waste products, excess water, and sodium in the
blood. The kidneys drain urine into the
bladder, which expands as it accumulates, sending nerve signals to the brain indicating the need to urinate.
Many illnesses can result from a problem with the body's kidney and urinary tract system. View sub-topics at right for information on kidney disease and urinary tract disorders and some of their common causes.
See Also
- Bladder Control & Urination Problems: Overview
- Kidney Failure
- 1,1,2-Trichloroethane
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