Medicine

What triggers the bladder to expel urine?

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When the level of urine reaches about half its maximum capacity, pressure of the accumulating fluid stimulates nervous impulses that relax the external sphincter, a muscle that forms a dense band around the urethra at the base of the bladder.

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Similar questions: What stimulates nervous impulses in the bladder? What causes pressure to indicate the bladder is full? What causes urine to be expelled from the bladder? How full is the bladder when nervous stimulation triggers it to empty? What sphincter must relax to expel urine? [ Hide these questions ]

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