Why does menstruation occur?
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Menstruation occurs when the egg is not fertilised. Every month, uterus prepares itself to receive a fertilised egg. To nourish the embryo, its lining becomes thick and spongy. In case, egg is not fertilised, this lining breaks and discharges out of the body through the vagina in the form of blood. This is referred to as menstruation.
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It is because,it forms a tough coating every month and when it does not receive the sperm it breaks all its preparations made by it so why mensuration happens. But when it gets sperm and if it is fertilised it Will then develop into a embryo so then mensuration does not occur
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