Estrogen

Estrogen or oestrogen is a group of female hormones.^[1] It includes oestrone (E1), oestradiol (E2), and oestriol (E3). Oestradiol is the most important oestrogen. Oestrogen is mainly secreted by the ovary, a small amount by the liver, adrenal cortex, and breast. In pregnancy, the placenta can also have a lot of secretion. Male testes also secrete a small amount. Ovary mainly secretes β-estradiol, other estrogens are less important.^[2]

Oestrogen helps women grow during puberty and is part of the menstrual cycle. During menopause, oestrogen levels go down. The male hormone that is similar is androgen.

References[change | change source]

↑ The word comes from the Greek οἶστρος, meaning gadfly. Its use here is not literal.
↑ Whitehead S.A. & Nussey S. 2001. Endocrinology: an integrated approach. Oxford: BIOS. ISBN 1-85996-252-1

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[1] The word comes from the Greek οἶστρος, meaning gadfly. Its use here is not literal.

[2] Whitehead S.A. & Nussey S. 2001. Endocrinology: an integrated approach. Oxford: BIOS. ISBN 1-85996-252-1

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Human reproductive system
Female anatomy	Female reproductive system – Breasts – Cervix – Clitoris – Clitoral hood – Fallopian tubes – Bartholin's glands – Gräfenberg spot (G-spot) – Hymen – Labia – Ovaries – Skene's glands – Urethra – Uterus – Vagina – Vulva
Female physiology	Menstruation – Pregnancy – Childbirth – Lactation – Estrogen – Orgasm – Ovum
Male anatomy	Male reproductive system – Bulbourethral glands – Corpus cavernosum – Ejaculatory ducts – Epididymis – Foreskin – Frenulum – Glans penis – Penis – Prostate – Rete testis – Scrotum – Seminal vesicles – Seminiferous tubules – Sertoli cell – Spermatic cord – Testicles (testes) – Urethra – Vasa deferentia
Male physiology	Ejaculation – Erection – Orgasm – Semen – Sperm – Testosterone
Anatomy is the study of the parts of the body • Physiology is the study of how the body works