Estrogen is secreted from which part of the body?

Estrogen is primarily secreted from the ovaries, which are the main reproductive organs in females. The ovaries produce estrogen as part of the menstrual cycle and are responsible for the development of secondary sexual characteristics such as breast development, the regulation of the menstrual cycle, and maintaining pregnancy. In addition to the ovaries, smaller amounts of estrogen can also be produced by other tissues in both males and females, but the ovaries are the primary source of estrogen in females.

The pancreas is primarily involved in regulating blood sugar levels through the secretion of insulin and glucagon, and it does not play a role in hormone production related to reproductive functions. The adrenal cortex does secrete hormones including cortisol and aldosterone, and also produces certain sex steroids, but it is not the main source of estrogen. The testes do produce some estrogen as well, but they are primarily responsible for the production of testosterone and other male hormones rather than being a significant source of estrogen. Thus, the ovaries are unequivocally the correct answer for the secretion of estrogen.