– estrogen maintains reproductive organs • LH stimulates ovulation & promotes formation of the corpus luteum which secretes estrogens, progesterone, relaxin and inhibin – progesterone prepares uterus for implantation and the mammary glands for milk secretion – relaxin facilitates implantation in the relaxed uterus – inhibin inhibits the secretion of FSH
High levels of estrogens (without progesterone) stimulate release of GnRH, LH, and FSH Moderate levels of estrogens inhibit secretion of GnRH, FSH, and LH Inhibin inhibits secretion of FSH and LH Low levels of progesterone and estrogens promote secretion of GnRH, FSH, and LH GnRH FSH LH Anterior pituitary Growth of primary and secondary follicles Maturation of one dominant follicle Ovulation Formation of corpus luteum Formation of corpus albicans Increased secretion of progesterone and estrogens by cells of corpus luteum Increased secretion of inhibin by cells of corpus luteum No secretion of progesterone and estrogens by corpus albicans Repair and proliferation of endometrium Preparation of endometrium for arrival of fertilized ovum Menstruation Uterus Ovarian hormones Ovary Hypothalamus Increasing secretion of estrogens and inhibin by granulosa cells
Hypothalamus Anterior pituitary gland GnRH FSH LH LH stimulates Corpus luteum Ovulation Ovaries Growing follicles Initial development of ovarian follicles Further development of ovarian follicles and their secretion of estrogens and inhibin Estrogens Progesterone Relaxin Inhibin • Promote development and maintenance of female reproductive structures, feminine secondary sex • characteristics, and breasts •
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- Spring '08
- progesterone, corpus luteum, Ovulation