The removal of inhibin A and estradiol and increasing GnRH pulses combine to

The removal of inhibin a and estradiol and increasing

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The removal of inhibin-A and estradiol and increasing GnRH pulses combine to allow greater secretion of FSH compared with LH. The increase in FSH is instrumental in rescuing approximately a 70- day-old group of ready follicles from atresia, allowing a dominant follicle to begin its emergence.
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Follicular Phase At the start of a menstrual cycle, a cohort of follicles are recruited (rescued) to undergo growth. An increase in FSH is the critical feature in rescuing a cohort of follicles from atresia. Usually each cohort of follicles that begins growth is engaged in a serious competition that ends with only one follicle succeeding. The ovulatory follicle is one selected from a cohort recruited at the time of the luteal-follicular transition. Initial follicular development occurs independently of hormone influence. FSH stimulation propels follicles to grow to the preantral stage. FSH-induced aromatization of androgen in the granulosa results in the rising of estrogen levels. Estrogen stimulates endometrial proliferation.
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Ovulation The LH surge initiates the continuation of meiosis in the
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  • Winter '16
  • Bill Oyieke

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