What is Menstrual Cycle If the egg is not fertilized, it lives for one day and is then expelled. This sets in motion which is called menstrual or ovarian cycle. The first menstruation is called menarche. It stops between age 45–50 years. Stoppage of menstruction permantely is called menopause. Menstrual cycle consists of four phases.Menstrual Phase : It is … [Read more...] about What is Menstrual Cycle