The process of urination involves a coordinated set of activities in which the bladder muscles tighten, pushing urine out of the bladder and into the urethra, a tube that transports it out of the body. As the bladder muscles contract, the smooth muscle tissue around the urethra relaxes to help the urine pass. These muscles are controlled by spinal nerves. When any of these actions occur involuntarily, leakage can result.
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