Mention the role of hormones during the menstrual cycle.

Explanation

Role of hormones in the menstrual cycle :
(i) FSH (Follicle Stimulating Hormone): 1. This hormone is secreted by anterior pituitary, it stimulates the growth of selected ovarian follicles and maturation of the primary oocyte.
2. It also stimulates the follicular cells of Graafian follicle to secrete a female sex hormone named Oestradiol (Oestrogen).
(ii) Role of Luteinizing Hormone (LH): It induces the mature Graafian follicle to burst and eject its egg into fallopian tube and stimulates the formation of corpus luteum. It.s surge causes ovulation.
(iii) Role of Progesterone :
1. It maintains the hypertrophy of endometrial lining in the uterus and fallopian tube.
2. It is required for proper implantation of foetus in the wall of uterus.
3. It stimulates the endometrial glands to secrete a nutrient fluid for foetus.
4. It inhibits the release of LH and hence inhibits its production.
(iv) GnRH released by hypothalamus regulates the release of FSH and LH from anterior pituitary.
(v) Oestrogen from ovary repairs the endometrial lining. High oestrogen stimulates LH and cuts off FSH.

whole chcle starts again as without progesterone linings peels off.