Which statement about fetal circulation is true?
Fetal circulation is no longer effective at birth.
Fetal circulation continues until red blood cells are broken down.
Fetal circulation continues until after the stress of labor.
Fetal circulation continues until adulthood.
The Correct Answer is C
Fetal circulation continues until after the stress of labor.
Choice A rationale:
Fetal circulation undergoes significant changes at birth. It becomes ineffective as the transition from intrauterine to extrauterine life occurs. The foramen ovale and ductus arteriosus, which allow blood to bypass certain fetal circulatory pathways, close as the baby breathes for the first time.
Choice B rationale:
Fetal circulation does not continue until red blood cells are broken down. Red blood cells in a fetus have a shorter lifespan than those in adults and are continually replaced throughout gestation. However, their breakdown is not the reason for the changes in fetal circulation.
Choice C rationale:
The correct answer. Fetal circulation continues until after the stress of labor. During labor, the baby experiences increased stress and pressure, which helps trigger various physiological changes, including the closure of specific fetal circulatory shunts.
Choice D rationale:
Fetal circulation does not continue until adulthood. As mentioned earlier, the transition from fetal to adult circulation occurs during and after birth, with the closure of specific fetal shunts and the establishment of a fully functional adult circulatory system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. This is not a primary consideration before bathing a newborn. The timing of the last feeding is more relevant to assessing the risk of hypoglycemia rather than determining readiness for a bath.
B. This temperature is slightly below the recommended range for newborns (36.5°C to 37.5°C). Bathing should be delayed until the newborn's temperature is stable.
C. While care of the umbilical cord is important, it does not determine the timing of the first bath. The cord can be kept dry even if the baby is bathed.
D. Ensuring that the newborn has maintained a stable body temperature for at least 2 hours is crucial before giving the first bath. Bathing can cause a drop in body temperature, so it's essential that the newborn's thermoregulation is stable to avoid hypothermia.
Correct Answer is A
Explanation
"My baby will be placed under special lights if the test is elevated.”.
Choice A rationale:
This statement indicates a need for further teaching. Phenylketonuria (PKU) is a metabolic disorder that leads to the accumulation of phenylalanine in the body. If the PKU test is elevated, it means that the baby has high levels of phenylalanine, and immediate dietary intervention is required. The parent's statement about special lights suggests a confusion with jaundice treatment, which is not related to PKU.
Choice B rationale:
This statement is accurate. Before the PKU test is done, the baby needs to consume formula or breast milk to ensure accurate test results.
Choice C rationale:
This statement is also accurate. PKU is a genetic disorder that can be managed with a special diet low in phenylalanine. By adhering to the prescribed diet, the harmful effects of PKU can be minimized.
Choice D rationale:
This statement is accurate. It is common for the PKU test to be repeated at the 2-week check- up to confirm the initial results and ensure early detection and management of PKU if present.
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