Describe the pattern of fetal blood flow to and from the placenta.
A) Deoxygenated blood flows from the fetus to the placenta through a pair of umbilical arteries,and oxygenated blood returns from the placenta in a single umbilical vein.
B) Deoxygenated blood flows from the fetus to the placenta through a pair of umbilical veins,and oxygenated blood returns from the placenta in a single umbilical artery.
C) Oxygenated blood flows from the fetus to the placenta through a pair of umbilical arteries,and deoxygenated blood returns from the placenta in a single umbilical vein.
D) Oxygenated blood flows from the fetus to the placenta through a pair of umbilical veins,and deoxygenated blood returns from the placenta in a single umbilical artery.
E) Deoxygenated blood flows from the fetus to the placenta through a single umbilical vein,and oxygenated blood returns from the placenta through a pair of umbilical arteries.
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