PHGY 210 Lecture Notes - Lecture 5: Breastfeeding, Granulosa Cell, Medical Abortion
27 Mar 2013
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Document Summary
1: 2 main phases follicular phase and divided by ovulation and the later half is the luteal phase. 2: understand the cycle of hormones through menstruation. Estrogen levels increase due to the late stages of follicular development. Estrogen causes an increase in the thickness in the endometrium and then starts to produce progesterone receptors (progesterone takes of in the luteal phase) Estradiol concentrations produce a lot of lh but at the same time is inhibiting the release of the lh. At a certain point there will be an lh surge (day 14)when the estradiol conc. are high enough and this causes ovulation. Fsh release is inhibited by inhibin released by granulosa cells. Lh stimulates follicular development and stimulates the development of estradiol. 5: oral contraceptive: suppress the release of lh and fsh- and they prevent the end result of low progesterone levelsand prevents ovulation. Corpus luteum: cranks out estrogen and progesterone which is imperative to implantation.
