I’ve never seen this aspect dealt with in any of the articles I’ve read about the urinary system
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But how your body senses a full bladder isn’t known. Certain proteins can be activated by cells being stretched or squeezed. One gene, called PIEZO2, holds the instructions to make such proteins. PIEZO2 has been shown to play a role in sensing mechanical stimulation, including touch, vibration, pain, and proprioception (the awareness of one’s body in space).
Pee zo 2