Menstrual Cycles What happens in the 28 Day monthly period The Menstrual Cycle Menstruation is a woman's monthly bleeding. It is also called menses, menstrual period, or period. When a woman has her period, she is menstruating. The menstrual blood is partly blood and partly tissue from the inside of the uterus (womb). It flows from the uterus through the small opening in the cervix, and passes out of the body through the vagina. Menstruation is part of the menstrual cycle, which helps a woman's body prepare for the possibility of pregnancy each month. A cycle begins on the first day of bleeding and continues up to, but not including, the first day of the next period. The average menstrual cycle is around 28 days long. However, a cycle can range anywhere from 21 days to 35 days or more. The length of a woman's cycle may change a little from month to month. Most menstrual periods can last from 1 to 8 days, with the average being 4 to 5 days. Periods are a normal part of a w
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