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The prostate (drawn in orange) is a walnut-sized gland that surrounds the urethra, the passage that allows urine to flow from the bladder (red) and out through the penis (blue).
Swelling of the prostate, whether by infection or a tumor, can slow or even stop the urine flow, by constricting the urethra.
(The second dark blue line through the prostate represents the connection to the seminal vesicle. For a more detailed drawing of the male urinary and reproductive system at this site click here.)
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