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placenta and fetal development

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* What is the story about the placenta and fetal development?

* What is the role of immune cells in the body? How would you expect the body to respond to these foreign cells? what is the normal immune responses and propose an explanation for the lack of a normal immune response in the case of microchimerism elopement?

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This solution clarifies placenta and fetal development.

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The placenta and the fetus both arise from the same fertilized egg. At the blastocyst stage, it is the trophoblasts that will become the placenta while the inner cell mass will become the fetus. The trophoblasts secrete enzymes that allow the cells to invade the uterine wall, into which the blood vessels from the developing fetus will grow into in order for the exchange of nutrients from the mother to the fetus ...

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