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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.

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10mo ago
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Q: Where in the girl's body does the period blood come from?
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