In women, urine exits the body via the urethra, reports Columbia Health. During menstruation, blood and endometrial tissue leave the body through the vagina, explains KidsHealth from Nemours.
The urethra is located above the vaginal opening, states Columbia Health. When a woman urinates, urine leaves her bladder and passes through the urethral opening.
Before a woman menstruates, the lining of her uterus thickens in case she conceives a baby, reports KidsHealth from Nemours. The lining of the uterus is called the endometrium. If the woman does not get pregnant, she has a menstrual period. This is when the body sheds the endometrial lining and an unfertilized egg.