Summary of female reproductive cycle days 1-28
Date Uploaded: 10/07/2019
Tags: homeworkclinic.com Homework Clinic HWC Summary of female reproductive cycle menstrual phase Progesterone and estrogen Menses preovulatory ovarian proliferative uterine Endometrial cells proliferate endometrium oocyte corpus luteum inhibin ovarian hormones Endometrial glands
■ The first five days of the cycle include the menstrual phase. ■ Progesterone and estrogen levels are low. ■ Menses occurs. ■ GnRH pulses more frequently promoting FSH and LH levels to rise. ■ Primary follicles are stimulated to develop. ■ Days five through thirteen consist of the preovulatory ovarian phase and the proliferative uterine phase. • Simultaneously, the production of estrogen increases, stimulating further follicular maturation. • Endometrial cells proliferate, thereby doubling the thickness of the endometrium. ■ Rising estrogen levels stimulate increased pulsing of GnRH and increased secretion of FSH and LH (positive feedback loop with estrogen). ■ Primary oocyte undergoes meiosis to form secondary oocyte. • Estrogen levels peak causing an LH surge. ■ LH stimulates the mature follicle to rupture and release the secondary oocyte. • Days 15-28 include the postovulatory ovarian phase and the secretory uterine phase. ■ The collapsed follicle becomes the corpus luteum, secreting greater amounts of progesterone, estrogen, and inhibin. ■ increased ovarian hormones, especially progesterone, promote endometrial proliferation and secretion. • Endometrial glands secrete glycogen preparing for implantation of an embryo. • Higher levels of inhibin stop the formation of LH and FSH by the anterior pituitary. • If the secondary oocyte is not fertilized, the corpus luteum degenerates and cycle begins again.
You must login to add videos to your playlists.