Oestrogen - GCSE Biology Definition

Oestrogen is a hormone that plays a key role in the development and functioning of the female body. It is produced mainly in the ovaries and is important for the development of female secondary sexual characteristics, such as breast growth, and for regulating the menstrual cycle. During puberty, oestrogen triggers changes that lead to sexual maturity. It also helps to maintain healthy bones and skin. While both males and females produce oestrogen, levels are much higher in females. In GCSE Biology, understanding oestrogen is important for explaining puberty, reproduction, and hormonal coordination in the body.