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Menstrual Cycle || Human reproduction || NCERT XII Class || By Nagavelli Prasad
The menstrual cycle is counted from the first day of one period to the first day of the next. The cycle isn't the same for everyone. Menstrual bleeding might happen every 21 to 35 days and last 2 to 7 days. For the first few years after menstruation begins, long cycles are common.
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