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 B
Explanation
Choice A rationale
A possible sign of pregnancy includes symptoms that are suggestive but not definitive, such as amenorrhea (absence of menstruation) or fatigue. These signs can have multiple causes and are not conclusive proof of pregnancy.
Choice B rationale
A positive sign of pregnancy includes objective evidence like fetal movement felt by the examiner, fetal heart sounds detected, or visualization of the fetus on ultrasound. These signs provide direct confirmation of pregnancy.
Choice C rationale
Presumptive signs of pregnancy are subjective experiences reported by the patient, such as nausea, breast tenderness, or quickening (feeling fetal movement). These signs are not confirmatory as they can occur in other conditions.
Choice D rationale
Probable signs of pregnancy include objective findings observed by a healthcare provider, such as uterine enlargement, but they are not definitive as they can also be caused by conditions like fibroids.
Correct Answer is B
Explanation
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.
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