An ultrasound of a fetus' heart shows that "normal fetal circulation is occurring." Which of the following statements is consistent with the finding?
a. A right to left shunt is seen between the atria.
b. Blood is returning to the placenta via the umbilical vein.
c. Blood is returning to the right atrium from the pulmonary system.
d. A right to left shunt is seen between the umbilical arteries.
ANS: a
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a. This is correct. The foramen ovale is a duct between the atria. In fetal circulation, there is a right to left shunt through the duct.
b. Blood returns to the placenta via the umbilical arteries.
c. Most of the blood bypasses the pulmonary system. The blood that does enter the pulmonary system returns to the left atrium.
d. There is no duct between the umbilical arteries.
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