When it is time to urinate, the bladder releases urine with a surprising amount of force. To handle this forceful expulsion, the urethra itself relaxes, allowing the urine to pass through and creating the familiar stream. Once the urine has exited the body, the two parts reverse their roles: the urethra contracts and the bladder relaxes. This process occurs out multiple times a day, depending on how much urine there is to eliminate.

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