Period blood comes from a girl's uterus. When a girl has her period, the uterus sheds the lining it builds up to feed an egg. When the egg isn't fertilized, the lining, which is made up of blood and clots, falls off of the walls and comes out of her cervix, the bottom of her uterus that opens into the end of the vagina, and then the blood flows down out of the opening of her vagina.
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Period blood comes from the uterus. During a woman's menstrual cycle, the lining of the uterus thickens in preparation for a potential pregnancy. If pregnancy does not occur, this lining sheds and is released through the vagina as period blood.
Menstrual blood exits the girl's body through the vagina during her period. The blood comes from the shedding of the uterine lining, which occurs monthly as part of the menstrual cycle.
During a period, the lining of the uterus sheds as a result of hormonal changes in the body. This shedding includes tissue and blood, which is expelled from the body through the vagina.
During menstruation the blood comes out via your vagina. Blood comes out of the uterus, passes through the cervix, then exits via your vagina - if menstruating you really should know how this process occurs.
The blood from a period comes out of the vagina. The shedding of the uterine lining and blood occurs through the cervix and out of the vagina during menstruation.
Blood comes out through the vagina during menstruation.