Final answer:
Estrogens are female sex hormones that play a vital role in the development and functioning of the female reproductive system.
Step-by-step explanation:
Estrogens are a class of predominantly female sex hormones that play a crucial role in the development and growth of the female reproductive tract, secondary sex characteristics, the female reproductive cycle, and the maintenance of pregnancy. The primary hormone in this class is called estradiol, which is secreted by the female sex glands, specifically the ovaries. Estradiol is responsible for promoting the development of female secondary sexual characteristics, such as breast development and increased deposition of fat in certain areas of the body.