1. Menstrual Cycle

2. Menstrual Cycle • Series of changes in ovary and uterus • Controlled by hormones • Starts at puberty • Ends at menopause • ~28 day cycle

3. 4 Stages • 1. Follicle Stage • Egg matures in follicle • FSH- follicle stimulating hormone • Follicle produces estrogen • Estrogen thickens lining of uterus • Lasts ~10 days

4. 2. Ovulation • Egg released from follicle (follicle breaks) • LH- leutinizing hormone • Egg picked up by fallopian tube • ~ day 14

5. 3. Corpus Luteum Stage • After ovulation, follicle fills with yellow tissue corpus luteum • Corpus luteum produces progesterone • Progesterone increases blood supply • Lasts ~ 14 days

6. 4. Menstruation • No fertilization= follicle breaks down • Produces less estrogen and progesterone • Lining of uterus shed • Lasts ~4 days

7. Occurs in a cycle