Menstrual cycles
A)Refer only to events occurring in the uterus
B)Are caused by changes in hormone levels
C)In normal women repeat every 28 days
D)Both refer only to events occurring in the uterus and are caused by changes in hormone levels are correct
E)All of the choices are correct

Question

Quizplus · Accepted Answer

Menstrual cycles are primarily regulated by changes in hormone levels, which affect both the ovaries and the uterus.

Menstrual Cycles