Paper called, The Human Embryo. Talks about all of the stages of pregnancy. Uses several sources to explain the changes that the baby goes through.

The Human Embryo

In the United States al superstar there is an average of some four million people born every twelvemonth (http://www.cdc.gov/nchs/releases/02news/womenbirths.html). In a normal maternalism the human embryo goes through a very complicated process. During the nine months of pregnancy the embryo develops all the basic things, such as the heart, liver, and brain, that it take to live in the outside world.

A nine-month pregnancy is divided, by doctors, into trinity trimesters of equal length. During each trimester the baby goes through different developments and continues to grow. The low gear trimester is considered the succession from conception to 13 weeks. Second trimester takes place from week 13 through week 29. The final trimester is week 29 through delivery, which is usually 38-40 weeks after conception.

Throughout a womans lifetime, from puberty to menopause, she pull up stakes ovulate about 400 times. To conceive a baby, the womans formal cell must be fertilized within 24 hours of when it was released. This, however, does not soaked the woman has to have sexual intercourse the day the ovum is released. Sperm fuel last several days wrong the woman, so having intercourse even 4-5 days before ovulation can cause conception (Nilsson 31). Fertilization is the moment one sperm cell penetrates the ovum.



At that same moment the DNA of the mother and give mix to form the genetic code for a fool a new human being (http://www.Standupgirl.com).

The sperm that penetrates the egg controls grammatical gender. every effeminate egg contains one X chromosome. Every sperm either contains one X or one Y chromosome. To be a male one X and one Y chromosome must be present. To be female two X-chromosomes are present. At the moment of conception the gender is decided. From that point on it can not change. All of the time there is 50%...

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