34.3 The Reproductive System –We learned that there are a group of related hormones called estrogens which include estrone, estradiol, and estriol are produced by the ovaries. The levels vary throughout a woman’s life. Structures such as the adrenal glands, fat tissue, and muscles produce small amounts of some estrogens too. Estrogens rise during puberty. We learned about the bacterial and viral sexually-transmitted diseases.