Menstruation is the breakdown of the uterus' endometrial lining and blood vessels, resulting in a liquid that is expelled through the vaginal canal. The menstrual flow lasts for three to five days. Menstruation occurs every 28/29 days in human females. If the released ovum is not fertilized, menstruation begins.
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Menstruation is the breakdown of the uterus' endometrial lining and blood vessels, resulting in a liquid that is expelled through the vaginal canal. The menstrual flow lasts for three to five days. Menstruation occurs every 28/29 days in human females. If the released ovum is not fertilized, menstruation begins.
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