Human Body

During puberty the eggs begin to mature. Each month one egg ripens and leaves the ovary. It passes through a fallopian tube where, if not fertilized by a sperm, it disintegrates. The uterus, which has built up tissue and blood to make a nourishing nest for the egg, sheds its lining about a week after the egg disintegrates. This is the event known as menstruation, or the menstrual period.

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