Anatomical Information about Urination
To urinate, the brain signals the muscular bladder wall to tighten, squeezing urine out of the bladder. At the same time, the brain signals the sphincters to relax. As the sphincters relax, urine exits the bladder through the urethra.
Source: NIDDK (NIH)2
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- Source: MeSH (U.S. National Library of Medicine)
- Source: NIDDK (NIH): niddk.nih.gov/ health-information/ urologic-diseases/ bladder-control-problems-men
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