Because without it, you risk your bladder filling past capacity, backing up into your kidneys and at best causing an infection and at worst killing you.
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Stretch receptors in the bladder tell your body that the urine pouch is near capacity. You have to empty it in order to prevent a backup or something worse.
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Are you asking why we have a limited capacity to hold urine or why we have a mechanism for knowing we’ve reached the limit?
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Because if we were incontinent, e we would just pee on ourselves all the time, which would lead to sickness and death, not just of ourselves, but if those around us.
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