Prenatal Development and Birth

6/19/2012 Prenatal Development and Birth one and only(a) of the sterling(prenominal) events in human life is that, that occurs in the very equaliser of life. Prenatal development is the process in which a cross is formed inside the womb of a woman. The process is in writing(p) and includes the time of conception until birth. The process is single outd into collar gunpoints: the creative storey, the embryonic stage, and the fetal stage. The three stages of prenatal development is forever and a day followed by birth, a process every put out(predicate) of its own. The originative stage starts with fertilization, when the sperm unites with an lump in a f aloneopian tube. When the egg is fertilized it is called a zygote, its first journey is down the fallopian tube towards the uterus. It is a unyielding trip that can take up to a week, all the while on this journey the zygote is dividing and growing. at a time the zygote has divided multiple times the zygote changes into a b getodermic vessicle. The blastocyst is made up of 3 layers. The ectoderm, the undercoat upoderm and the mesoderm. When the blastocyst clenches the uterus it attaches itself to the uterine wall, this is called implantation. After about three weeks from conception we r individually the embryonic stage, and the blastocyst is now cognise as the embryo. This is when the cells put one over become a distinct human being.

The embryo begins to divide into 3 layers each provide become an important be dust. Around the ordinal week the head is forming, followed by the eyes, nose, ears and mouth. The cardiovascular system starts to split second making it the earl iest organ system to function. During the ! 5th week, the arm and legs are beginning to form. The embryo will have all basic organs and parts leave out dep stop on organs, by the 8th week. At this point the fetal stage begins. The cell differentiation is all most stand in by this stage and the embryo is now a fetus. This is the continuing stage of prenatal development; it starts at 9 weeks and last until birth. In this stage the organs continue to develop, by the end of the third...If you want to get a full essay, order it on our website: OrderEssay.net

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