Q:

By the 4th month, the barrier separating maternal and fetal blood is comprised of:

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By the 4th month, the barrier separating maternal and fetal blood is comprised of:


  1. syncytium and endothelium
  2. endothelium and cytotrophoblast
  3. syncytium an cytotrophoblast
  4. endothelium and connective tissue
  5. all of the above (A-D)

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A. syncytium and endothelium

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