Question

Ureters don't have valves at their ends opening into urinary bladder, yet urine doesn't flow back into them on contraction of gall bladder.

Answer 1

Answer:

Each ureter has a one-way valve where it enters the bladder that prevents urine from flowing back up the ureter. But in some people, urine flows back up to the kidney. This is called vesicoureteral reflux. Over time, the kidneys may be damaged or scarred by this reflux.

Explanation: