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periods also known as mensuration or date, is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. it occurs every month in the human female body and lasts for 4 -6 days.
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It is nothing but the menstrual cycle that happens in every mature female.The monthly cyclic changes of the ovary and endometrium is called as menstrual cycle.It consists of three phases follicular phase,luteal phase and menstrution.Periods is the flow of blood from the genital canal which takes place during menstruation.
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