Which sequence of events accurately describes circulation in the umbilical cord?
a. Oxygenated blood flows from the fetus to the placenta through the umbilical vein.
b. Deoxygenated blood flows from the fetus to the placenta through the umbilical arteries.
c. Deoxygenated blood flows from the placenta to the fetus through the umbilical artery.
d. Oxygenated blood flows from the placenta to the fetus through the umbilical artery.
ANS: B
From the fetus, deoxygenated blood flows through the two umbilical arteries to the placenta, where carbon dioxide and waste products are passed into the maternal blood for elimination. Oxygenated blood passes from the mother, through the placenta, into the umbilical vein, and to the fetus.
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