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Ovarian Cycle (hypothalamus releases GnRH (GnRH acts on gonadotrophs in…

- - - - Follicular Phase
        
        anterior pituitary releases FSH and LH; FSH is higher than LH
        
        FSH acts on granulosa cells
        
        stimulates synthesis of estrogen and estradiol
        
        high levels of estrogen toward end of follicular phase
        
        positive feedback loop (increases estrogen)
        
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        low levels of estradiol at beginning of follicular phase
        
        negative feedback (increases estrogen)
        
        1 more item...
        
        LH acts on theca cells and granulosa cells
      - Luteal Phase
        
        negative feedback decreases all levels: LH, FSH, estradiol and progestrone
      - Ovulatory Phase
        
        extreme increase in estradiol causes the anterior pituitary releases more LH than FSH
        
        decrease in FSH causes a decrease in estradiol
        
        negative feedback to decrease estradiol
        
        progesterone increases due to increase LH
        
        positive feedback to increase progesterone