When Does The Placenta Form ?
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The nine-month long human pregnancy is divided into three trimesters. The first trimester starts from the first week of pregnancy till the 14th week.
The second trimester lasts from the 15th to the 26th week of pregnancy. The third and last trimester begins in the 27th week of pregnancy and culminates in the 40th week of pregnancy. In the first two weeks of pregnancy, the woman’s body starts to ovulate. It is during this period that the sperm fertilizes the egg. In the third week of pregnancy, the fertilized egg moves into the fallopian tubes. It is in the fourth week of pregnancy that the placenta I formed.
By the fourth week, the woman’s body is aware of the pregnancy. The amniotic sac and amniotic cavity start to develop. The blood from the mother’s body starts to flow to the placenta. Women start experiencing the early symptoms of pregnancy such as morning sickness, which usually surfaces around the 27th day of pregnancy.
In the meanwhile, the placenta that develops is made up of capillaries. These capillaries carry the embryo’s blood. The placenta, at this time, has thin walls that help it to supply mother’s blood to the fetus, while also bringing other nutrients and well as removing the waste. The thin placenta walls also transport oxygen to the fetus. The placenta is formed in a way that while oxygen and other nutrients get transferred from the mother’s body to the fetus, their blood never mixes.
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