Which is the major estrogen produced by the ovaries?

• A. Estrone
• B. Estradiol
• C. Progesterone
• D. Testosterone

Answer: (B)

The major estrogen produced by the ovaries is estradiol. Estradiol is the most potent and biologically active form of estrogen and plays a crucial role in a variety of physiological processes, including the regulation of the menstrual cycle, the development of female secondary sexual characteristics, and the maintenance of pregnancy.

Estrone, while also an estrogen, is produced in much smaller quantities compared to estradiol and is considered less potent. Progesterone, on the other hand, is a hormone involved in the menstrual cycle and pregnancy, but it is not classified as an estrogen. Testosterone is primarily an androgen, though it can be converted to estrogen in the body, its primary roles differ significantly from those of the estrogens produced by the ovaries. Therefore, understanding that estradiol is the dominant form of estrogen synthesized in the ovaries helps clarify its importance in female reproductive health.