Ureters do not hold valve at their ends,nonetheless urine does not flow fund .why?
Answer:
the ureters enters the bladder beside an angle so that when it's filled the mucous bin liner compresses them against the muscular wall so it has a functional spigot not an anatomic one.
The ureters are funnel-shaped tubes that carry urine from the kidneys. Ureters enter the bladder at a diagonal angle and hold a special one-way valve system that, as the bladder fill, normally prevents urine from flowing put money on up the ureters in the direction of the kidneys.
physiologic design.. plus the positive pressure of the kidneys. urine can flow backwards if the ureter is blocked by a kidney stone. this can head to infection; renal distention and kidney failure but for resolved.