Fetal grow inside the mother's body the nurture with growth enough need is qualitative, and the blood that these nutrient material basically come from a mother, the food that the mother's body eats is absorbed through digesting enter blood, nutrient material adopts placenta and umbilical supply baby in consist in blood!
The mother is in pregnant whole process, the nourishment that fetal place needs and oxygen, carry through placenta and umbilical cord fetal. Fetal basically passing placenta and umbilical cord to connect with the mother's body is, the nutrient material in blood of consist in matrix also is classics placenta and umbilical cord medium blood-vessel is carried fetal. Placental from be pregnant the first month begins to be formed gradually, to the 3rd month, placenta is formed already completely, mix through umbilical cord fetal be linked together.
Placenta is maintaining fetal grow there is the following and main effect in the process: The first, material exchanges a function: Include substance of form of aeriform exchange, nutrition to supply, eduction is fetal metabolization child, mother the oxygen between and carbon dioxide are exchanged with the means that diffuses simply in placenta, fulfil the function of fetal respiratory system; The main nurture that fetal place needs is qualitative -- dextrose, all originate the mother's body furnishs through placenta fetal, other nutrition material if: Amino acid, calcic, phosphor, iron also furnish with same way; Meanwhile, fetal metabolization child also is to pass placenta to turn input mother blood, again by body of eduction of the mother's body outside.
The 2nd, defence function: Placenta is right fetal have certain protective effect, the bacterium inside the mother's body and toxin cannot enter fetal blood directly normally, but, placental protective screen action also is very finite, still can infect virus of nettle rash virus, afterbirth of large and small through placenta fetal, this also is gravid one of main reasons that the woman of before 3 months needs special attention to prevent a disease.
The 3rd, synthesize a function: A variety of hormone reach placental complex grow factor, normal to maintaining gravid have main effect, also have main effect to fetal nutrition and immune protection. Besides, fetal the development that still can carry deglutition or inspiratory amniotic fluid to promote enteron and lung inside the mother's body maintains dynamic balance, so, amniotic fluid is in fetal growth also has very main effect in development process!
This period answer advocate: Master of Zhou Shishi medicine
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