The perinatal nurse is teaching nursing students about fetal circulation and explains that fetal blood flows through the superior vena cava into the right __________ via the __________
Fill in the blank with the appropriate word.
ANS: atrium; foramen ovale
Blood flows through the vein from the placenta to the fetus. Most of the blood bypasses the liver and then enters the inferior vena cava by way of the ductus venosus, a vascular channel that connects the umbilical vein to the inferior vena cava. The blood then empties into the right atrium, passes through the foramen ovale (an opening in the septum between the right and left atrium) into the left atrium, and then moves into the right ventricle and on into the aorta. From the aorta, blood travels to the head, upper extremities, and lower extremities.
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