Question

In menstrual cycle which reproductive organs undergo changes?

Answer 1

Menstrual cycle takes place in all primates including human beings(in females)

A menstrual cycle in females is usually of $28$ days.

In the menstrual cycle, changes take place in both ovaries and uterus(womb). These changes arise due to the change in the levels of pituitary hormones (follicle stimulating hormone & Luetinising hormone) that induce changes in the ovarian hormones (estrogen and Progesterone).