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rising estrogen mid-cycle
positive feedback → LH surge → ovulation
high progesterone
negative feedback → inhibits FSH and LH
oxytocin during labour
positive feedback → more contractions
follicular phase
FSH → follicles mature → estrogen → negative: FSH decreases OR positive: GnRH increase → LH surge →ovulation
luteal phase
corpus luteum → progresterone increase + estrogen → thickens endometrium
progesterone increase + estrogen → negative feedback: decrease GnRH → decrease FSH and LH