Multiple choice

Which of the following signifies the oxygen transport by fetal blood?

  1. In a developing embryo, the blood bouncing back to the umbilical vein is completely saturated with O2.

  2. Fetal hemoglobin has a higher compatibility for oxygen than adult hemoglobin.

  3. In a normal foetus, the blood has a lower hemoglobin content than adult blood.

  4. Blood reaching the brain of a fetus has the same PO2 as that of blood in the descending aorta.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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