Pregnancy Childbirth 08

I did erase all the copied part that had absolutely no sense here. I want you to follow the rules... Okay?--Pierre.brawand 24 janvier 2009 à 14:24 (MET)

What is pregnancy?

For human beings, pregnancy occurs amongst the female, taking place precisely in the uterus. It is the state of carrying one or more embryos that will eventually develop into a foetus, during a period of nine months. This period starts at conception and ends at the point of delivery.

There is not a HUMAN RACE. You should use either "For humans", or "For human beings", ok?--Pierre.brawand 24 janvier 2009 à 14:24 (MET)

How does pregnancy occur?

Pregnancy occurs by the implantation of the embryo (which is at this stage a ball of rapidly multiplying cells called the blastocyst) into the uterus about three or four days after fertilization. The embryo will then develop and grow inside the uterus for a period of nine months (about 266 days) and during this time, various changes occur in the mother's body in order to accomodate the growing foetus.

you could briefly mention how the embryo is generated: fertilization of two gametes to create a zygote, and then the cleavage state that generates the embryo.--Pierre.brawand 24 janvier 2009 à 14:24 (MET) Pregnancy is divided into three trimesters, each of which lasting about three months each. These trimesters help us to monitor the growth of the baby and the changes occuring inside the mother's body. Although complications such as miscarriages can occur, the foetus usually grows healthily during pregnancy, recieving its nutrients from it's mother and growing in a safe and comfortable environnement which is the uterus.

the monitoring is performed not only on the embryo/fetus, but also on the mother...--Pierre.brawand 24 janvier 2009 à 14:24 (MET)

What are the different stages of pregnancy?

First trimester

The first trimester of pregnancy lasts for about 14 weeks. At the beggining, it's an embryo 'till about 5 weeks of life and it looks like any other vertebrate embryo. (see annexe 1)

After 9 weeks de organs begin to devellop and the embryo has now a human form and is called a fetus. The fetus measures about 5.5 cm long. At the end of the trimester it looks like a mini human and we can now know it's sex by doing an ultrasound exam ( see annexe 2 & 3)

What is childbirth?

Childbirth is the step that follows the period of nine months of pregnency (about 42 weeks), when the developed feotus or baby is pushed out the uterus of the mother to the outside world. It's actually a whole process that includes two phases: labor and delivery. The latter are themselves divided into different stages.

References

still a lot a work to be done...--Pierre.brawand 24 janvier 2009 à 14:24 (MET)

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