on day 10 era 17. What uterine tissue undergoes dramatic changes during the menstrual cycle) rual cycle? endometrium cely? Explain why three da interval, 14-16 days around ountation th 18. When during the female menstrual cycle would fertilization be most likely? Explain why 19. The menstrual cycle depends on events within the female ovary. The ends on events within the female ovary. The stages of the menstrual cycle are listed below. For each pote its approximate time span and the related events in the uterus, and then to the right, record the ovarian events occurring simultaneously. Pay particular attention to hormonal events. Menstrual cycle stage Uterine events Ovarian events Menstruation Days 1-5 Proliferative Days 6-14 Secretory Days 15-28 20. Endometriosis occurs when fragments of endometrial tissue undergo retrograde (moving backward) menstruation resulting in displaced tissue that often attaches to the peritoneum of the pelvic cavity. These fragments respond to hormonal changes, resulting in bouts of severe pain even after menstruation has ended. Explain how the female anatomy contributes to the ability of this tissue to relocate and attach to the peritoneum. 21. Natural family planning, or fertility awareness, is a method that can be used to achieve or prevent pregnancy. It is based the ability to predict ovulation. Measuring which hormone would be the best predictor for ovulation, and why