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Physics 11 Online
OpenStudy (anonymous):

What prevents the backflow of urine from the urinary bladder to the kidneys? peristaltic action of muscles of the ureters peristaltic action of muscles of the kidneys pulling action of the force of gravity @Love_Ranaa

OpenStudy (anonymous):

@insa

OpenStudy (insa):

its not the last one. im not sure if the first or second

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