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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.
Parasympathetic Stimulation causes reflexive urination. 1. causes Detrusor muscle in the walls of the urinary bladder to contract and put pressure on the urine 2. Internal urethral sphincter will relax and open. Urine can move out of bladder and into urethra. 3. External urethral sphincter will also relax and open allowing urine to flow out of the body.