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Because of the one-way valve system of the ureters, which connect the kidneys to the bladder. If these ureter valves do not work properly, they can cause urine to back-flow into the ureters and toward the kidneys.

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14y ago
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5mo ago

Urine does not flow back to the kidney because of the one-way flow of urine through the urinary system, controlled by valves that prevent backflow. The ureters have muscular walls that contract and relax to push urine towards the bladder, preventing reverse flow. Additionally, the angle at which the ureters enter the bladder also helps to prevent urine from flowing back towards the kidneys.

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Q: Why does urine not flow back to the kidney?
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