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Menstrual cycle
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=== Luteal Phase === After ovulation, the empty follicle will begin to die. This dying follicle is called a corpus luteum. As the corpus luteum degrades, it secretes three hormones: estrogen, inhibin, and progesterone. Inhibin provides a negative feedback to the pituitary to suppress the production of FSH. Progesterone provides a similar feedback to prohibit the release of GnRH, which in turn decreases the levels of LH and FSH. It also stimulates endometrial growth (the interior lining of the uterus). As the corpus luteum degenerates, it will secrete fewer and fewer hormones, and progesterone, estrogen, and inhibin will steadily decrease. In the absence of fertilization, the decreasing levels of progesterone can no longer maintain the lining of the uterine wall, so the wall dies and sheds out of the body, resulting in menstruation. This decrease in progesterone also allows for the secretion of GnRH to begin again, and the cycle repeats.<ref>{{Cite book | last = Reed | first = Beverly G. | last2 = Carr | first2 = Bruce R. | date = 2000 | editor-last = Feingold|editor-first = Kenneth R.|editor2-last=Anawalt|editor2-first = Bradley|editor3-last=Boyce|editor3-first = Alison|editor4-last=Chrousos|editor4-first = George|editor5-last=Dungan|editor5-first = Kathleen|editor6-last=Grossman|editor6-first = Ashley|editor7-last=Hershman|editor7-first = Jerome M.|editor8-last=Kaltsas|editor8-first = Gregory|editor9-last=Koch|editor9-first = Christian | title = The Normal Menstrual Cycle and the Control of Ovulation | url =http://www.ncbi.nlm.nih.gov/books/NBK279054/|location=South Dartmouth (MA)|publisher=MDText.com, Inc.|pmid=25905282}}</ref>
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