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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 female and male urinary system are very similar, differing only in the length of the urethra. Urine is formed in the kidneys through a filtration of blood. The urine is then passed through the ureters to the bladder, where it is stored.During urination, the urine is passed from the bladder through the urethra to the outside of the body. 800â2,000 milliliters (mL) of urine are normally produced every day in a healthy human.This amount varies according to fluid intake and kidney function.uring urination, the urine is passed from the bladder through the urethra to the outside of the body. 800â2,000 milliliters (mL) of urine are normally produced every day in a healthy human. This amount varies according to fluid intake and kidney function.