問題詳情

69. Which of the following statements about the estrus cycle is NOT correct?
(A) each cycle takesapproximately 28 days to complete
(B) FSH stimulates follicle growth
(C) LH surge promotes ovulation
(D) corpus luteum secrets progesterone and estradiol to elicit a positive feedback loop to stimulate GnRHreleasing from hypothalamus
(E) elderly women undergo menopause, the cessation of ovulation andmenstruation

參考答案

答案：D
難度：計算中-1
書單：沒有書單，新增

用户評論

【aa61882011】評論

(C)  corpus luteum secrets progesterone and estradiol to elicit a positive feedback negative feedback loop to stimulate inhibit GnRH releasing from hypothalamus 卵巢週期始於✔️下視丘釋放GnRH✔️垂體前葉釋放FSH → 濾泡生長(一) Follicular Phase濾泡生長初期E2濃度低 (∵E2存於follicle)低濃度E2 : 抑制FSH、GnTH 釋放濾泡生長≈2cmE2濃度高高濃度E2 : 促LH、GnRH 釋放(二) OvulationLH surge (LH高峰) : 排卵 → 釋出次級卵母細胞(n)(三) Luteal PhaseLH刺激黃體分泌 : Progesterone、Estradiol!! Progesterone↑、Estradiol↑ : 抑制 GnRH、FSH、LH 釋放 !!懷孕 : 持續抑制，維持內膜厚度；無懷孕 : Progesterone↓、Estradiol↓ 不再抑制GnRH，子宮經前列腺素刺激收縮，開始新的週期。