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How
Babies are Made - The Basics
The
Reproductive System of a woman
The Menstrual Cycle The aspect of the reproductive system that women are most aware of is the menstrual period which they have every month. The menstrual cycle is the time from the beginning of one period to the beginning of the next one. Usually menstrual cycles last about 28- 35 days, though anywhere from 3 to 6 weeks is considered normal. During the menstrual cycle, the uterus gets ready for pregnancy. Under the influence of the hormones estrogen and progesterone, its lining grows rich and thick to prepare for the fertilized egg. If pregnancy doesn't occur, the uterus must get rid of this lining so that it can grow a new one in the next cycle. The old lining passes out of the uterus through the vagina as the menstrual flow. The menstrual flow thus consists of: the shed uterine lining; blood (this comes from the blood vessels which are torn when the lining is shed); and the degenerated unfertilised egg. If the menstrual flow is heavy, there
may sometimes be clots in it. Sometimes the uterine lining is shed as large
fragments - and these may sometimes looks like bits of pregnancy tissue
to some women, who think they are miscarrying.
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