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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. Many of your body parts work with each other to form the Urinary System. Urine is taken out of the body if these parts work with each other in the right order. This allows normal urination to happen. For both men and women, the main parts of the system are Kidneys, Ureters, Bladder and Urethra. Urine is produced in the kidneys. It flows through tubes called ureters, and into the bladder. Urine leaves the body through the urethra.