The fallopian tube transports eggs to the uterus and is where fertilization with sperm takes place. For the first 8 weeks the stage of growth is called an embryo. It appears firm, round, and gray-white. Multiple growths of this kind develop most often in the wall of the uterus. They usually occur in women between 30 and 50 years of age.
Hormones travel throughout the bloodstream to act on target organs and regulate their activity.
The best-known hormonal contraceptives are the various types of birth control pills, but injectable contraceptives and implants are also available. Kinds of lipids include cholesterol, fatty acids, neutral fat, and triglycerides. There is now a new generation of low-dose oral contraceptives that contain 20 micrograms of estrogen per pill. The follicles in the ovaries stop producing eggs and estrogen production diminishes. It is this reduction of estrogen that causes the symptoms associated with menopause.