Female menstrual cycle and basic concepts The female menstrual cycle generally lasts about 28 days. This is a cycle of the ovary. During this cycle, the ovary completes physiological processes such as ovulation, mucus secretion, and lutein production. In this cycle, women are divided into menstruation, ovulation and fallopian tube phases. The menstrual period refers to the time when the uterus sheds blood from the villous blood vessels, usually 5-7 days. The ovulation period refers to the time when the eggs in the ovaries are released, lasting 2-3 days. The fallopian tube phase refers to the eggs entering the uterus through the fallopian tubes. when