|example, its specialized cells regulate the process whereby the embryo attaches to the uterine wall, the first step in pregnancy. If this initial event fails, then the |
|end result is either infertility or early pregnancy loss. Once pregnancy is established, the placenta continues to play an important role by extracting food and oxygen |
|from maternal blood and returning waste products that are produced by the baby... displayed 300 characters
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Thus, before birth the placenta performs functions that are taken over by the digestive |
|system, lungs and kidneys after birth. For this reason it is logical to hypothesize that, in many cases, infertility, pregnancy complications and impaired growth of the |
|baby can all be traced to abnormal placental development caused by exposure to cigarette smoke... displayed next 300 characters
The degree to which damage to the developing nervous system harms the mind and body varies enormously. Many disabilities are mild enough to allow those afflicted to eventually function independently in society...
These kinds of stem cells come from embryos and fetal tissue.
In 1998, for the first time, investigators were able to isolate this class of pluripotent stem cell from early human embryos and grow them in culture...
Instead of waiting for a heart to become available upon the death of a donor, hearts can be grown in a lab using stem cells. By using stem cells, doctors would not have to worry about biocompatibility...
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