MSD Manual

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Ureters

By

Glenn M. Preminger

, MD, Duke Comprehensive Kidney Stone Center

Last full review/revision Jun 2019| Content last modified Jan 2020
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Topic Resources

Urine formed in the kidneys flows through the ureters into the bladder, but it does not flow passively. The ureters push each small amount of urine along in waves of contraction, at low pressure. At the bladder, each ureter passes through an opening in the bladder wall, which closes when the bladder contracts to prevent urine from flowing back into the ureter (reflux).

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Kidney Infection
Pyelonephritis is an infection that affects one or both kidneys. Which of the following is the most likely cause of this infection?
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