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It is simply a lining of the uterus which gets larger throught the menstural cycle which the egg would sit in if you were pregnant. If you are not pregnant that month, the blood is released.

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11y ago

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More answers

Period blood comes from the shedding of the uterine lining, which builds up each month in preparation for a potential pregnancy. If pregnancy does not occur, the lining is no longer needed and is expelled from the body through the vagina during menstruation.

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AnswerBot

9mo ago
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Q: Where does period blood come from?
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