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The Menstrual Cycle About every 28 days, nearly inventory and other products of the disintegration of the inner lining of the uterus (the endometrium) ar discharged from the uterus, a process calledmenstruation. During this time a tender follicle begins to develop in one of the ovaries. after(prenominal) menstruation ceases, the follicle continues to develop, secreting an gain amount of  estrogen as it does so. The procession level of estrogen causes the endometrium to become thicker and more richly supplied with blood vessels and glands. A acclivitous level of LH causes the developing egg within the follicle to bleak the first meiotic division (meiosis I), forming a secondary oocyte. aft(prenominal) about two weeks, there is a sudden surge along in the production of LH. This surge in LH triggers ovulation: the eat up of the secondary oocyte into the fallopian tube. Under the continued square off of LH, the now-empt y follicle develops into a  principal sum luteum (hence the name luteinizing hormone for LH).

bear on by LH, the corpus luteum secretes progesterone which o continues the preparation of the endometrium for a possible pregnancy o inhibits the condensing of the uterus o inhibits the development of a new follicle If fertilization does not  make out (which is usually the case), o the rising level of progesterone inhibits the spillage of GnRH which, in turn, o inhibits further production of progesterone. As the progester one level drops, o the corpus ! luteum begins to degenerate; o the endometrium begins to violate 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: BestEssayCheap.com

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