Menstrual flow begins in response to ____.
A)rising levels of FSH and LH
B)falling levels of estrogen only
C)falling levels of progesterone only
D)falling levels of estrogen and progesterone
E)rising levels of LH and falling levels of FSH

Question

Quizplus · Accepted Answer

Menstrual flow begins in response to falling levels of estrogen and progesterone, which triggers the shedding of the endometrium. FSH and LH levels also play a role in the menstrual cycle, but they are not the direct trigger for the onset of menstrual flow.

Menstrual Flow Begins in Response to ____