MICROANATOMY

Detailed explanation-1: -Secondary sexual characteristics, such as pubic and armpit hair, also start to grow when estrogen levels rise. Many organ systems, including the musculoskeletal and cardiovascular systems, and the brain are affected by estrogen.

Detailed explanation-2: -Estrogens are a group of steroid hormones that regulate reproductive function and secondary sex characteristics in the female, including breast development.

Detailed explanation-3: -Estrogen also induces growth of the uterus, proliferation of the endometrium, and menstruation. Female secondary sex characteristics include: Enlargement of breasts and erection of nipples. Growth of body hair, most prominently underarm and pubic hair. Widening of hips; lower waist to hip ratio than adult males.