How is backflow of urine, Ask an Expert

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How is backflow of urine prevented?

Select one.

A.
Urethral sphincters keep urine from flowing back into the kidneys.
B.
Valve-like folds in the bladder prevent urine from flowing back into urethra.
C.
Smooth muscle in the urethra prevents urine from flowing back into the bladder.
D.
One-way valves in calyces prevent urine from flowing into the medulla.

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Biology, Academics

Category:- Biology
Reference No.:- M9438921

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