Prenatal Development

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  • Sperm Cells
  • Conception: Eggs and Sperm
  • An Egg
  • Sperm cells surround an egg, which leads to the fusing of the two, creating a single cell. The cell, then subdivides again and again to soon create a human being. 
  • A Zygote
  • Zygote and Embryo
  • A fertilized egg is called a zygote. It enters a two-week period of rapid cell division and develops into an embryo. An embryo is a developing human organism from about two weeks after fertilization through the 2nd month. 
  • An Embryo
  • A Placenta
  • Placenta
  • A placenta is a life-link that transfers nutrients and oxygen from mother to embryo.
  • A fetus is a developing human organism from 9 weeks after conception to birth. 
  • Fetus
  • Teratogens
  • Teratogens, or "monster makers", are agents, such as chemicals and viruses, that can reach the embryo or fetus during prenatal development and cause harm. 
  • Fetal Alcohol Syndrome (FAS)
  • Physical and cognitive abnormalities in children are caused by a pregnant woman's heavy drinking, in the case of the child having FAS. In severe cases, signs include a small, out-of-proportion head, and abnormal facial features. 
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