New answers tagged urine
3
The act of urination goes like this (Visible Body):
Micturition, or urination, is the act of emptying the bladder. When
the bladder is full of urine, stretch receptors in the bladder wall
trigger the micturition reflex. The detrusor muscle that surrounds
the bladder contracts. The internal urethral sphincter
relaxes, allowing for urine to pass out ...
1
There's no extra muscle involved - it's like squeezing an almost-empty toothpaste tube to get the last bits of toothpaste out.
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