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Male urinary system. Computer artwork of the front view of a man, showing the organs of the urinary (renal) system. The urinary tract is divided into the upper urinary tract: two kidneys (upper left and right), each with a calyx and a ureter (vertical, centre) - and the lower urinary tract: the bladder (centre) and urethra (lower centre). Urine, produced continuously by the kidneys, is collected in the calyx then conveyed to the bladder via connecting tubes, the ureters. Contraction of the muscles in the wall of the bladder causes urine to flow out of the body via the urethra.
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