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.
As your ovaries age and release fewer hormones, FSH and LH can no longer perform their usual functions to regulate your estrogen, progesterone and testosterone. These inevitable changes in your hormones and natural decline of estrogen levels during menopause can significantly affect your health for years to come. Click on the bars next to diagram to discover how estrogen depletion can affect each part of your body.