Question

Why mensuration occurs?

Answer 1

when no fertilization occurs the ovum distingerates and the corpus lueteum stops producing progesterone. As a result, the thickened linning of the utreus restarts shedding on the 28th day and loses blood which escapes through the crevix and vagina.

Answer 2

Its an usual 28 days cycle in females which is due to that when fertilisation of an ovum and sperm doesn’t occur then there is degeneration of endometrium a wall of uterus which causes the bleeding known as menstruation