The reason much of the blood in the fetal right atrium is shunted to the left atrium through the foramen ovale is
A. the blood pressure in the left atrium is greater than in the right atrium.
B. the fetus is in an antigravity situation provided by the amnionic fluid.
C. there is a valve that directs the blood that way.
D. the umbilical arteries have valves.
E. the blood pressure in the right atrium is greater than in the left atrium.
Answer: E
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