Describe ovulation process

First, a follicle develops inside an ovary. The development of follicle is stimulated by FSH. The developing follicle secretes oestrogen. Levels of oestrogen steadily increase in blood. The oestrogen makes the uterus lining thick and spongy. LH and FSH are secreted by the pituitary gland throughout this whole time. These two hormones stimulate follicle to keep secreting oestrogen. When the follicle is fully developed, there is a surge in the production of LH. This causes ovulation to take place. The now empty follicle stops secreting oestrogen. It becomes corpus luteum. The corpus luteum secretes progesterone. Levels of LH and FSH fall. Progesterone keeps the uterus lining thick, spongy and well supplied with blood in case the egg is fertilized. If not, corpus luteum disappears gradually and progesterone is no longer secreted so uterus lining breaks down and mensuration occurs. A new follicle develops and the cycle begins again.