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The Biology of Prenatal Development


Introdução


THE BIOLOGY OF PRENATAL DEVELOPMENT

.English


 

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Capítulo 1   Introdução

Reproduzir Filme - The Dynamic Process
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The dynamic process by which the single-cell human zygote becomes a 100-trillion-cell adult is perhaps the most remarkable phenomenon in all of nature.

Reproduzir Filme - Routine Functions
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Researchers now know that many of the routine functions performed by the adult body become established during pregnancy - often long before birth.

Reproduzir Filme - The Developmental Period
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The developmental period before birth is increasingly understood as a time of preparation during which the developing human acquires the many structures, and practices the many skills, needed for survival after birth.

Capítulo 2   Terminologia

Pregnancy in humans normally lasts approximately 38 weeks as measured from the time of fertilization, or conception, until birth.

Reproduzir Filme - The Embryonic Period
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During the first 8 weeks following fertilization, the developing human is called an embryo, which means "growing within." This time, called the embryonic period, is characterized by the formation of most major body systems.

Reproduzir Filme - The Fetal Period
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From the completion of 8 weeks until the end of pregnancy, "the developing human is called a fetus," which means "unborn offspring." During this time, called the fetal period, the body grows larger and its systems begin to function.

Reproduzir Filme - Size Comparison
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All embryonic and fetal ages in this program refer to the time since fertilization.
Introdução