Menstruation begins because
A) The pituitary triggers it
B) Luteinizing hormone is at its peak
C) Estrogen activity peaks
D) Progesterone production is highest
E) Progesterone and estrogen levels decline

Question

Quizplus · Accepted Answer

Menstruation begins because progesterone and estrogen levels decline. This withdrawal of the hormones causes the lining of the uterus to shed, resulting in menstrual bleeding.

Menstruation Begins Because