It also has to do with the neurologic control of the bladder.
From a neurologic point of view it’s not easy to control your bladder then decide to take a piss. It actually requires exquisite control and coordination by your nervous system. Almost all of this is happening at an unconscious level, just like digesting your food is a complex, coordinated activity that you don’t have to think about.
You can’t hook up the transplant recipient’s bladder to the nervous systemic a functional way, so the new bladder wouldn’t work like you would hope it would.
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