Blood is carried from the fetus to the placenta by the ____________________, and this blood has high levels of the gas ____________________.
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Q135: The umbilical arteries carry blood from the
Q136: Blood is carried from the placenta to
Q137: In the embryo, the three germ layers,
Q138: During an average gestation period, the period
Q139: The site of exchanges between maternal blood
Q141: During the first stage of labor, the
Q142: In later pregnancy, the placenta secretes the
Q143: During the second stage of labor, _.
Q144: During the _ stage of labor, the
Q145: The function of the placental hormone hCG
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