After about five days, estrogen levels rise and the menstrual cycle enters the proliferative phase. The endometrium begins to regrow, replacing the blood vessels and glands that deteriorated during the end of the last cycle. What happens after about five days?
1) The menstrual cycle enters the secretory phase.
2) The menstrual cycle enters the menstrual phase.
3) The menstrual cycle enters the ovulatory phase.
4) The menstrual cycle enters the luteal phase.
