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Describe menustral cycle?

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https://www.meritnation.com/ask-answer/question/what-is-menstrual-cycle-xplain-broadly-urgent/excretory-products-and-their-elimination/6694996

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Menstruation - having periods - is part of the female reproductive cycle that starts when girls become sexually mature at the time of puberty.

During a menstrual period, a woman bleeds from her uterus (womb) via the vagina. This lasts anything from three to seven days. Each period commences approximately every 28 days

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Menstruation is the process of the shedding of the uterine lining on a regular monthly basis. It begins at puberty in females. Every month, the uterus prepares itself to receive a fertilized egg. Therefore, the inner lining of the uterus becomes thick and is supplied with blood to nourish the embryo. If the egg is not fertilized, then the lining of the uterus breaks down and gets released in the form of blood through the vagina. This lasts for about two to eight days. This cycle occurs every month and is known as the menstrual cycle.

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