How is the placenta formed? What are its functions?

The placenta is an essential organ that develops during pregnancy in mammals, including humans. It forms when the fertilized egg implants in the uterus and begins to grow. The placenta is responsible for several important functions, including the exchange of nutrients and waste products between the mother and fetus, the production of hormones, and the protection of the developing fetus from harmful substances. In this article, we will discuss the process of placental formation and its functions in more detail.

Formation of the Placenta:

The formation of the placenta begins soon after fertilization when the blastocyst, a hollow ball of cells, implants in the lining of the uterus. The outer layer of cells of the blastocyst, called the trophoblast, begins to differentiate into two distinct layers: the cytotrophoblast and the syncytiotrophoblast. The cytotrophoblast is a layer of cells that remain distinct and continue to _________ __________ ____ __________ _____ ________ ______.
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