1. Did you know? At least 40% of all girls get pregnant before they turn 20 years old. -Resource Center for Adolescent Pregnancy Prevention

2. Review of Female Anatomy

3. Objectives for today: Objective 13: –Describe the ovarian cycle phases Objective 14: –Describe the regulation of the menstrual cycle Put it all together!

4. Objective 13 The menstrual cycle is the periodic, cyclic discharge of blood, secretions, tissue and mucus from the mature female uterus in the absence of pregnancy The ovarian cycle is the monthly cycle of follicle development, ovulation and corpus luteum formation in an ovary.

5. The Ovarian Cycle consists of three phases: The follicular phase is the period of follicle growth from the first to the tenth day of the cycle The ovulatory phase lasts from day 11 to day 14, and ends in ovulation The luteal phase, days 14-28, is the period of corpus luteum activity.

7. Hormones involved in ovarian cycle: Follicle-stimulating hormone (FSH) –Stimulates follicular growth Luteinizing hormone (LH) –A sudden burst of LH is responsible for the completion of meiosis in the primary oocyte

8. Menstrual Cycle Regulation Estrogen –Promotes oogenesis and follicle growth –Secondary sex characteristics Progesterone –Promotes changes in cervical mucus –Important in pregnancy

10. Let’s Put it all Together