Trosa is a municipality in central Sweden, in the county of Södermanland. The municipality covers an area of 207.9 km². Of the total population of 10197, 5105 are male, and 5092 are female. The population density of the community is 49 inhabitants per km².
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The external urethral sphincter is the skeletal muscle that allows voluntary control over urination.
In the human female, the urethra is about 1-1.5 inches ...