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Menstrual cycle, Description, Phases, Hormonal Control, Ovulation, & Menstruation

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Menstrual cycle, recurring fluctuations in hormone levels that produce physical changes in the uterus and ovaries to prepare the female body for pregnancy. In adult women, the menstrual cycle lasts anywhere from 21 to 40 days. Learn about the phases and hormonal control of the menstrual cycle.

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