And so we'll have the process of menstruation that will initiate and this will discharge the endometrium along with that secondary oxide. And so the thickness of the endometrium will begin to decrease. And at the end of the 28th period, when the estrogen and progesterone concentration drops that entire process, the menstrual cycle will essentially repeat itself once again. So this is the process we call the menstrual cycle. It's the process by which the female individual prepares the uterus for a possible pregnancy, for a possible implantation. But as the case is usually if no if the woman is not sexually active and no fertilization actually takes place, then that leads to the process of menstruation which is categorized by the discharge of the endometrium and the secondary oicide to the outside environment.