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  2. Estrogen - Wikipedia

    en.wikipedia.org/wiki/Estrogen

    The four major naturally occurring estrogens in women are estrone (E1), estradiol (E2), estriol (E3), and estetrol (E4). Estradiol (E2) is the predominant estrogen during reproductive years both in terms of absolute serum levels as well as in terms of estrogenic activity.

  3. Estradiol - Wikipedia

    en.wikipedia.org/wiki/Estradiol

    Upon menopause in females, production of estrogens by the ovaries stops and estradiol levels decrease to very low levels. In addition to its role as a natural hormone, estradiol is used as a medication , for instance in menopausal hormone therapy and feminizing hormone therapy for transgender women ; for information on estradiol as a medication ...

  4. Breast development - Wikipedia

    en.wikipedia.org/wiki/Breast_development

    The combination of much higher levels of androgens (about 10-fold higher) and much lower levels of estrogen (about 10-fold less), [51] due to the ovaries in females producing high amounts of estrogens but low amounts of androgens and the testes in males producing high amounts of androgens but low amounts of estrogens, [52] are why males ...

  5. Sex hormone - Wikipedia

    en.wikipedia.org/wiki/Sex_hormone

    Ethinylestradiol is a semi-synthetic estrogen. Specific compounds that have partial agonist activity for steroid receptors , and therefore act in part like natural steroid hormones, are in use in medical conditions that require treatment with steroid in one cell type, but where systemic effects of the particular steroid in the entire organism ...

  6. Pregnancy hormones - Wikipedia

    en.wikipedia.org/wiki/Pregnancy_hormones

    Estrogen promotes the development of breast cancers that have estrogen receptor (ER) by stimulating the proliferation and survival of breast cancer cells. [39] Estrogen receptor (ER) is a significant indicator for predicting outcomes and guiding treatment decisions, and it is found in around 75% of breast cancers. [ 39 ]

  7. Estrous cycle - Wikipedia

    en.wikipedia.org/wiki/Estrous_cycle

    Under regulation by gonadotropic hormones, ovarian follicles mature and estrogen secretions exert their biggest influence. The female then exhibits sexually receptive behavior, [12] a situation that may be signaled by visible physiologic changes. Estrus is commonly seen in the mammalian species, including some primates.

  8. Secondary sex characteristic - Wikipedia

    en.wikipedia.org/wiki/Secondary_sex_characteristic

    In females, breasts are a manifestation of higher levels of estrogen; estrogen also widens the pelvis and increases the amount of body fat in hips, thighs, buttocks, and breasts. [1] [2] Estrogen also induces growth of the uterus, proliferation of the endometrium, and menstruation. [1] Female secondary sex characteristics include:

  9. List of human hormones - Wikipedia

    en.wikipedia.org/wiki/List_of_human_hormones

    The following is a list of hormones found in Humans. Spelling is not uniform for many hormones. For example, current North American and international usage uses [citation needed] estrogen and gonadotropin, while British usage retains the Greek digraph in oestrogen and favours the earlier spelling gonadotrophin.