After having an ultrasound, the fetus' heart shows that "normal fetal circulation is occurring.”. The RN is teaching a pregnant client about normal fetal circulation.Which of the following statements is consistent with the finding?
Blood is returning to the right atrium from the pulmonary system.
Blood is returning to the placenta via the umbilical arteries.
Blood is being shunted to the right side from the left side of the heart.
A right to left shunt is seen between the umbilical arteries.
The Correct Answer is B
Choice A rationale
Blood returning to the right atrium from the pulmonary system is consistent with adult circulation, not fetal circulation. In fetal circulation, blood bypasses the lungs via the ductus arteriosus and foramen ovale since the fetus receives oxygenated blood from the placenta, not the lungs.
Choice B rationale
Blood is returning to the placenta via the umbilical arteries. In fetal circulation, deoxygenated blood is carried from the fetus to the placenta through the umbilical arteries. This is consistent with normal fetal circulation as the placenta is responsible for gas exchange.
Choice C rationale
Blood being shunted to the right side from the left side of the heart is incorrect. In fetal circulation, there is a right-to-left shunt through the foramen ovale, allowing blood to bypass the non-functioning fetal lungs and go directly into systemic circulation.
Choice D rationale
A right-to-left shunt is not seen between the umbilical arteries. Instead, the shunts in fetal circulation are the ductus venosus, ductus arteriosus, and foramen ovale, which help reroute blood away from the fetal lungs and liver.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["1.7"]
Explanation
Step 1: 2 mg/kg × 3400 g × (1 kg ÷ 1000 g) = 0.68 mg
Step 2: 68 mg × (1 mL ÷ 0.4 mg) = 1.7 mL.
The nurse will administer 1.7 mL.
Correct Answer is A
Explanation
Choice A rationale
Increasing folic acid intake immediately is recommended because it helps prevent neural tube defects, which can occur very early in pregnancy, often before a woman knows she is pregnant.
Choice B rationale
Starting folic acid intake one week before her period is not sufficient. Folic acid needs to be taken consistently before conception and during early pregnancy to be effective.
Choice C rationale
Waiting until pregnancy is confirmed may be too late to prevent neural tube defects, which form in the early weeks of pregnancy.
Choice D rationale
If she misses her period, it might already be too late to prevent neural tube defects. Consistent intake of folic acid before and during early pregnancy is essential.
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