If fertilization does not occur, the corpus luteum regresses. This results in a(n) decrease in the concentrations of estrogen and progesterone, which means that the hypothalamus will secrete gonadotropin releasing hormone (GnRh) to cause the ovarian cycle to repeat. If fertilization occurs, the corpus luteum does not regress because the embryo secretes human chorionic gonadotropin (hCG) . The corpus luteum secretes moderate estrogen and high levels of progesterone to prevent menstruation.多重下拉选择题

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