Relating to the Fetal Circulatory System,which Special Characteristics Allow the Fetus

Multiple Choice

Relating to the fetal circulatory system,which special characteristics allow the fetus to obtain sufficient oxygen from the maternal blood?
(Select all that apply) .

A) Fetal hemoglobin (Hb) carries 20% to 30% more oxygen than maternal Hb.
B) Fetal Hb carries 40% to 50% more oxygen than maternal Hb.
C) Hb concentration is 50% higher than that of the mother.
D) Fetal heart rate is 110 to 160 beats per minute.
E) Fetal heart rate is 160 to 200 beats per minute.