The placental barrier limits the kind and amount of material exchanged between the pregnant woman and her fetus. Which one of the following is a structure of the placental barrier?

Question

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All of the above
The placental barrier is composed of structures that separate the maternal and fetal blood. It is a semipermeable layer of tissue in the placenta. The composition of the placental barrier changes over the course of the pregnancy (from first to third trimester). Structures of the placental barrier include:
1) Suncytiotrophoblast
2) Cytotrophoblast (Langhans' cells)
3) Basement membrane
4) Stromal tissue
5) Endothelium

The Placental Barrier Limits the Kind and Amount of Material