During a prenatal examination, a client asks, "How does my baby get air?" The nurse would give correct information by saying:
1. "The lungs of the fetus carry out respiratory gas exchange in utero."
2. "The placenta assumes the function of the fetal lungs by supplying oxygen and allowing the excretion of carbon dioxide into your bloodstream."
3. "The blood from the placenta is carried through the umbilical artery, which penetrates the abdominal wall of the fetus."
4. "The fetus is able to obtain sufficient oxygen because your hemoglobin concentration is 50% greater during pregnancy."
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Rationale:
1. "The lungs of the fetus carry out respiratory gas exchange in utero" is incorrect. Most of the blood supply bypasses the fetal lungs, which do not carry out respiratory gas exchange.
2. "The placenta assumes the function of the fetal lungs by supplying oxygen and allowing the excretion of carbon dioxide into your bloodstream" is the correct information.
3. "The blood from the placenta is carried through the umbilical artery, which penetrates the abdominal wall of the fetus" is incorrect because blood is carried through the umbilical vein.
4. "The fetus is able to obtain sufficient oxygen because your hemoglobin concentration is 50% greater during pregnancy," benefiting the mother in the event of future blood loss in birth.
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