Multiple choice

Select the true statement regarding oxygen carriage by fetal blood in mother's womb.

  1. Blood returning to the developing embryo by the umbilical vein is fully saturated with oxygen.

  2. The develpoing embryo's hemoglobin has a higher affinity for oxygen than adult's hemoglobin.

  3. Fetal blood has a lower hemoglobin content than adult blood.

  4. Blood perfusing the brain of a develpoing embryo has the same PO2 as that of blood in the descending aorta.
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B Correct answer
Explanation

Fetal blood has a higher hemoglobin content than adult blood and fetal hemoglobin has a higher affinity for O2 than adult hemoglobin. The O2 content of blood in the umbilical vein is about 160 ml/l.

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