The bladder is an organ in the lower abdomen that stores urine before it leaves the body. It expands as it fills and contracts when you go to the bathroom.
From Old English “blǣdre,” meaning “blister” or “bubble,” related to “blow” as in to swell with air or liquid. The word originally referred to any sac-like structure.
Your bladder is basically a stretchy, muscular water balloon your body controls with valves and nerves. The urgent “I have to go now” feeling is your nervous system shouting that the balloon is reaching its safe limit.
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