Biology, 30.01.2020 21:53, bryn2433

What prevents the backflow of urine from the urinary bladder to the kidneys?

1. peristaltic action of muscles of the ureters
2. peristaltic action of muscles of the kidneys
3. pulling action of the force of gravity

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What prevents the backflow of urine from the urinary bladder to the kidneys?

1. perista...