Bio2 Lecture 11

Bio2 Lecture 11 - Bio2 Lecture 11 2/22/05 Hormones,...

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Bio2 Lecture 11 2/22/05 Hormones, Follicle, and Endometrial Development - Estrodial is the hormone that stimulates woman - During the menstrual phase, in which the endometrium is shed, GnRH is released which stimulates the anterior pituitary to release FSH and LH - FSH stimulates the development of a few follicles in the ovary - When you look at the cervical fluid that is not exposed to estrogen is random snotty after its dried - The fluid that has been exposed to estrogen is crystallized and they align themselves in tracks and in your cervix they are creating preferred pathways to the ovary - Estrogen comes out of a follicle, and estrodial has negative feedback on hypothalamus and pituitary to reduce outputs of gonatotrophs - And when level get really high it causes ovulation, what was the follicle becomes the corpus luteum - Only primate corpus luteum produce estrodial and progesterone - Only primates menstruate, which is from the combined action of 2 hormones on the uterus - At time of period, ovary is filled with mostly just primary follicles, under influence of FSH you have secondary follicles and estrodial production, then it produces more estrogen and your endometrial wall gets thicker and its growing in response to estrogen, then when estrogen has reached its peak and stimulates LH surge the secondary follicle becomes the corpus luteum. Then the rate of growth that the endometrium is thickening is much greater, its not only under the influence of estrogen but also progesterone, and the progesterone exposure causes the growth of endometrial glands which increases surface area of endometrium (increases possibility of implantation (pregnancy)) also the source of a number of secretions for the embryo if it may end up near the endometrium. If there is no fertilization the endometrium cannot support itself, and the estrogen and progesterone levels drop and it removes the negative feedback on brain pituitary
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This note was uploaded on 08/10/2009 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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Bio2 Lecture 11 - Bio2 Lecture 11 2/22/05 Hormones,...

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