Urinary tract

The part of the body concerned with the formation and excretion of urine. The urinary tract consists of the kidneys (with their blood and nerve supplies), the renal pelvises (funnelshaped ducts that channel urine from the kidneys), the ureters, the bladder, and the urethra. The kidneys make urine by filtering blood. The urine collects in the renal pelvises and is then passed down the ureters into the bladder by the actions of gravity and peristalsis. Urine is stored in the bladder until there is a sufficient amount present to stimulate micturition. When the bladder contracts, the urine is expelled through the urethra.


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