the.com/ureter
a muscular straw that actively pumps your urine uphill, defying gravity twice daily and constantly.
squeeze, not dripPeristaltic waves push urine, not gravity.
narrow trioThree pinch points where kidney stones lodge.
the lengthRoughly 25 to 30 centimeters each side.
worst painStones here rival childbirth on pain scales.
valve trickSlits into bladder prevent backflow under pressure.