Many steels add to the iron-steel mix other metals that give the entire substance desirable properties such as strength, heat resistance, or flexibility. Steel is considered a mixture rather than a compound because the iron does not chemically bond with the carbon and other components.
Some of estrogen's effects include: 1  Increasing serotonin, and the number of serotonin receptors in the brain. 2  Modifying the production and the effects of endorphins, the feel-good chemicals in the brain. 3  Protecting nerves from damage, and possibly stimulating nerve growth.
Women have more estrogen and men have more testosterone. In women, estrogen helps initiate sexual development. It also regulates a womanâs menstrual cycle and affects the entire reproductive system. High estrogen or estrogen dominance can happen if estrogen levels are too great.omen have more estrogen and men have more testosterone. In women, estrogen helps initiate sexual development. It also regulates a womanâs menstrual cycle and affects the entire reproductive system. High estrogen or estrogen dominance can happen if estrogen levels are too great.