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Essay / Research Paper Abstract
A 6 pages research that discusses the various stages of prenatal development, the methods of prenatal diagnosis of abnormalities, and the effects of teratogens. Bibliography lists 6 sources.
Page Count:
6 pages (~225 words per page)
File: KL9_khprenatal.rtf
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Unformatted sample text from the term paper:
the appearance of being "made up of small particles inside larger ones" (Lightfoot, Cole & Cole 2009, p. 85). The center of this mass contains the nucleus, and the genes
reside with this center. The nucleus is surrounded by the cell matter that provides the raw material that is necessary for the first cell divisions to occur (Lightfoot, Cole &
Cole 2009). Scientists frequently categorize prenatal development as occurring in three periods of growth. These stages are the germinal period, the embryonic period, and the fetal period (Lightfoot, Cole
& Cole 2009). Typically only 300 to 500 sperm survive the roughly 6-hour journey into and down the fallopian tubes to encounter the egg (Sigelman & Rider 2009). The
germinal periods refers to when the germ cells of the mother and father join at conception and lasts until the zygote implants into the wall of the uterus, which takes
roughly 8 to 10 days (Lightfoot, Cole & Cole 2009). The embryonic period begins at this point and extends to the end
of the eighth week, which is when all of the major organs have grown and have a primitive shape (Lightfoot, Cole & Cole 2009). By the time the zygote implants
in the uterus, it has become a blastocyst and the layers of the blastocyst begin to differentiate, with the outer layer becoming the amnion, a "watertight membrane that fills with
fluid that cushions and protect the embryo" and the chorion, which is a "membrane that surrounds the amnion and attacks rootlike extensions called villi to the uterine lining to gather
nourishment for the embryo" (Sigelman & Rider 2009, p. 92). The fetal period begins with the ninth week, which is when the
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