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Changes in the urinary system during pregnancy. The body goes through many changes during pregnancy. Significant anatomical changes occur in the urinary system. Under the influence of the hormone progesterone, the kidneys and the ureters dilate. This can lead to a slow down in the flow of urine through the ureters and therefore an increased risk of urinary infection in pregnancy.
The Urinary System-Design: parts of the urinary system. The main organs of the urinary system are the kidneys, which form urine. The other parts of the systemâthe ureters, the urinary bladder, and the urethraâneither form urine nor change its composition.