Q. The hormones that act on ovaries for the secretion of estrogen and progesterone are
Solution:
The ovary is regulated by pituitary gonadotropins or GnRH. The anterior pituitary secretes follicle-stimulating hormone (FSH) which controls the transformation of the young primary follicle into Graafian follicle, maturation of ovum and secretion of estrogens by its follicular cells. The Luteinizing hormone (LH) of anterior pituitary regulates the ovulation from the Graafian follicle, the transformation of empty Graafian follicle into yellowish coloured corpus luteum and secretion of progesterone hormone from the corpus luteum.
Estrogens produce wide-ranging actions such as the appearance of female secondary sex characters (e.g., the high pitch of voice, etc.), stimulation of growth and activities of female secondary sex organs, and mammary gland development. Estrogens also regulate female sexual behavior. It also inhibits the secretion of FSH.
Progesterone supports pregnancy, acts on the mammary glands and stimulates the development of mammary alveoli. It also strengthens uterine wall. Apart from that, it provides negative feedback inhibition to LH and GnRH, thus inhibiting the production of both FSH and LH.
Estrogens produce wide-ranging actions such as the appearance of female secondary sex characters (e.g., the high pitch of voice, etc.), stimulation of growth and activities of female secondary sex organs, and mammary gland development. Estrogens also regulate female sexual behavior. It also inhibits the secretion of FSH.
Progesterone supports pregnancy, acts on the mammary glands and stimulates the development of mammary alveoli. It also strengthens uterine wall. Apart from that, it provides negative feedback inhibition to LH and GnRH, thus inhibiting the production of both FSH and LH.