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The Menstrual Cycle About all(prenominal) 28 days, some stock and other products of the disintegration of the sexual lining of the uterus (the endometrium) ar discharged from the uterus, a potry called menses. During this time a adoring follicle begins to develop in mavin of the ovaries. after(prenominal) menstruation ceases, the follicle continues to develop, secreting an increase fall of  estrogen as it does so. The emission level of estrogen causes the endometrium to move around thicker and more richly supplied with telephone line vessels and glands. A move level of LH causes the developing addict within the follicle to free the outset meiotic division (meiosis I), forming a secondary oocyte. After virtually two weeks, there is a sudden whizz along in the production of LH. This surge in LH triggers ovulation: the discharge up of the secondary oocyte into the fallopian tube. on a lower floor the continued influence of LH, the now-empty follicle develops into a  principal sum luteum (hence the diagnose luteinizing hormone for LH).

Stimulated by LH, the corpus luteum secretes progesterone which o continues the preparation of the endometrium for a realistic pregnancy o inhibits the abridgment of the uterus o inhibits the development of a sensitive follicle If fertilization does not  snuff it (which is usually the case), o the rising level of progesterone inhibits the vent-hole of GnRH which, in turn, o inhibits but production of progesterone. As the progesterone level drops, o the corpus luteum begins to degenerate; o the endometrium begins to dash down, its cells committing programmed cell death (apoptosis); o the inhibition of uterine contraction is lifted, and o the bleeding and cramps of menstruation begin. [pic]If you want to obtain a full essay, order it on our website: Ordercustompaper.com

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