Menstruation is triggered by a drop in the level(s)of
A) FSH.
B) LH.
C) relaxin.
D) estrogen and progesterone.
E) human chorionic gonadotropin.

Question

Quizplus · Accepted Answer

Menstruation is triggered by a drop in the levels of estrogen and progesterone. This drop occurs because the corpus luteum in the ovary, which produces these hormones, begins to break down if fertilization does not occur. Without high levels of estrogen and progesterone to maintain the uterine lining, it is shed during menstruation. FSH and LH are involved in stimulating the development of the ovarian follicles, but they do not directly trigger menstruation. Relaxin and hCG are also not directly involved in menstruation.

Menstruation Is Triggered by a Drop in the Level(s)of