Describe the role of hormones in menstruation/ menstrual cycle in human females.

-After/ at the onset of menstruation, (the anterior lobe of) pituitary gland secretes Follicle Stimulating Hormone (FSH); which causes/ stimulates the Graafian follicle to develop in the ovary; which contains the ovum. It also stimulates the ovary tissues to secrete Oestrogen hormone;
-Oestrogen hormone brings about/ causes/ stimulates repair and healing of endometrium/ uterine lining; (after menstruation). Its concentration increases to a level which stimulates the (anterior lobe of the) pituitary gland to secrete Luteinizing hormone; and stops further secretion of Follicle stimulating hormone;
-Luteinising hormone stimulates the maturation of Graafian follicle; stimulates or causes ovulation/stimulates the Graafian follicle to burst releasing the ovum; it also stimulates the remains of Graafian follicle to form a yellow body (Corpus luteum) in the ovary; and stimulates the corpus luteum to secrete progesterone hormone;
-Progesterone stimulates thickening of endometrium/ inner lining of uterine wall in readiness for implantation; As the level of progesterone increases it inhibits the pituitary gland from secreting follicle stimulating hormone; Further increase in progesterone level inhibits the pituitary gland from secreting Luteinizing hormone; Further increase in progesterone level causes the corpus luteum to degenerate;
-Degeneration of corpus luteum reduces the amount of progesterone; the sudden drop in secretion of progesterone causes the endometrium to slough off/ menstruation occurs; and the cycle is then repeated;