A nurse is caring for a newborn. How many blood vessels should the nurse expect to observe in the newborn's umbilical cord?
Two arteries and two veins.
One artery and one vein.
Two arteries and one vein.
Two veins and one artery.
The Correct Answer is C
Choice A rationale:
The umbilical cord typically contains two arteries and one vein. Arteries carry oxygen-depleted blood and waste products from the fetus to the placenta for removal, while the vein carries oxygenated blood and nutrients from the placenta to the fetus. This arrangement is essential for maintaining proper fetal circulation during pregnancy.
Choice B rationale:
This choice is incorrect because the umbilical cord usually contains two arteries and one vein, not just one artery and one vein. Having only one artery could indicate a potential vascular abnormality or congenital issue that may require further investigation or medical attention.
Choice C rationale:
This is the correct answer. The umbilical cord usually contains two arteries and one vein. The presence of two arteries allows for the efficient removal of waste products and carbon dioxide from the fetus, while the single vein delivers essential nutrients and oxygen to support the baby's growth and development.
Choice D rationale:
This choice is incorrect as it states two veins and one artery, which is not the typical configuration of blood vessels in the umbilical cord. Having two veins and one artery would disrupt fetal circulation and hinder proper nutrient and waste exchange between the fetus and the placenta.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale:
If the client is Rh positive and the newborn is Rh negative, there is no indication for administering Rho(D) immune globulin. Rho(D) immune globulin is only given when the Rh-negative mother gives birth to an Rh-positive baby.
Choice B rationale:
This is the correct choice for administering Rho(D) immune globulin. When the mother is Rh negative and the newborn is Rh positive, there is a risk of Rh incompatibility. If the fetal blood enters the mother's circulation during delivery, her immune system may produce antibodies against Rh-positive blood cells, which can be harmful to future Rh-positive pregnancies. To prevent this, Rho(D) immune globulin is administered to the Rh-negative mother shortly after delivery.
Choice C rationale:
If both the mother and the newborn are Rh-negative, there is no risk of Rh incompatibility. Rho(D) immune globulin is not required in this situation.
Choice D rationale:
If both the mother and the newborn are Rh-positive, there is no risk of Rh incompatibility. Rho(D) immune globulin is not indicated in this case.
Correct Answer is D
Explanation
The correct answer is choice d. Vastus lateralis.
Choice A rationale:
The deltoid muscle is not typically used for newborn injections because it is too small and underdeveloped, making it an inappropriate site for intramuscular injections in this age group.
Choice B rationale:
The dorsogluteal muscle is also not recommended for newborns due to the risk of injury to the sciatic nerve and the muscle’s underdevelopment.
Choice C rationale:
The ventrogluteal muscle, while a good site for older children and adults, is not commonly used for newborns because it is not as easily accessible and developed as the vastus lateralis.
Choice D rationale:
The vastus lateralis muscle, located on the anterolateral aspect of the thigh, is the preferred site for intramuscular injections in newborns. It is well-developed and provides a large muscle mass, making it the safest and most effective site for administering vitamin K.
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