The cycle of event taking place in the ovaries and urethra every twenty eight days and marked by the mensterual this type of cycle is called mansterual cycle
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It occur in girl after the age of puberty
The breakdown or removal of inner thick or soft linling of uterus with blood in the form of vaginal bleeding

Menstruation cycle means every month female ovary releases a egg and when it does not get fertiliized with a sperm or male gamate then from the ****** the outer lining of uterus falls down with mucous in formmof blood . The duration is 8 to 9 days