試題詳解

15. Which activity can appear in lhe ovarian cycle?
(A) FSH stimulates tiie pituitary to release GnRH.
(B) When FSH and LH levels foil, the corpus luteum shrinks and tiie uterine lining breaks down.
(C) Luteinizing hormone stimulates the uterus to make progesterone.
(D) Estrogen levels initially have a positive feedback effect on the pituitary, which is followed by higher estrogen levels causing negative feedback.
(E)一律給分