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chapter 13 - Chapter 13 Prenatal Development and the...

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Chapter 13 Prenatal Development and the Newborn - Process of reproduction in humans starts with woman’s ovary releases a mature egg, - A woman was born with all the immature eggs she will ever have, although only 1 in 5000 will ever be matured and released, a man begins producing sperm cells at puberty for the rest of his life after that he produces sperm cells - 200 million or more sperm cells race to approach the egg that is about 85,000 times the size of itself , after the few reach the egg, they release the digestive enzymes that eat away at the protective coating , as soon as one sperm penetrates, the egg’s surface blocks all others .. before half a day, the egg nucleus and the sperm nucleus fuse - Prenatal Development o Zygotes: fertilized egg. o Few than half of all zygotes survive beyond the first 2 weeks , the cell division until it produces a zygote of some 100 cells within the first week, that is when the cells begin to differentiate and specialize in function and structure o About 10 days after conception, the zygote attaches to the mother’s uterine wall and
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