The umbilical cord is a temporary anatomical structure connecting the fetus and placenta, and permits the circulation of fetal blood. Of the following, which are included in the composition of the umbilical cord?
  1. Covering epithelium
  2. Blood vessels
  3. Allantosis
  4. All of the above
Explanation
Answer: D - All of the above

Structures of the umbilical cord includes:
1) Covering epithelium
2) Wharton's jelly
3) Blood vessels
4) Remnants of the umbilical vesicle
5) Allantosis
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