Q:

During the later stages of pregnancy, maternal blood is separated from fetal blood by the

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During the later stages of pregnancy, maternal blood is separated from fetal blood by the


  1. syncytiotrophoblast only
  2. cytotrophoblast only
  3. syncytiotrophoblast and cytotrophoblast
  4. syncytiotrophoblast and fetal endothe- lium
  5. cytotrophoblast and fetal endothelium

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D. During the later stages of pregnancy, the placental membrane becomes very thin and consists of two layers—the syncytiotrophoblast and the fetal endothelium.

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