In girl, the first menstruation begins at puberty and is called .....
Menarche
Menstrual cycle
Menopause
None
The placenta helps in the maintenance of pregnancy by secreting a hormone, known as
Lack of menstruation is caused due to
The substance secreted by the corpus luteum is
Secretion of progesterone by corpus luteum is initiated by
Cessation of menstrual cycle in the human female is known as