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 ["B","C","D"]
Explanation
Choice A: Warm the bottle in the microwave.
- Rationale: Warming bottles in the microwave is not recommended. Microwaving can cause uneven heating, creating hot spots in the milk or formula that can burn the baby's mouth. Instead, bottles should be warmed by placing them in a container of warm water or using a bottle warmer.
Choice B: Store prepared bottles in the refrigerator.
- Correct
- Rationale: Prepared bottles of formula should be stored in the refrigerator to prevent bacterial growth. Formula should be used within 24 hours of preparation when properly stored in the refrigerator.
Choice C: Discard unused formula in used bottle after 2 hours.
- Correct
- Rationale: Any unused formula that has been in contact with the baby’s mouth should be discarded after 2 hours due to the risk of bacterial contamination. Bacteria from the baby's saliva can grow in the leftover formula.
Choice D: Never prop a bottle.
- Correct
- Rationale: Bottles should never be propped up and left in the baby’s mouth. This practice increases the risk of choking, ear infections, and tooth decay. Caregivers should always hold the bottle and the baby during feedings.
Choice E: Formula is available in three forms.
- Correct
- Rationale: Formula is available in three forms: powdered, concentrated liquid, and ready-to-feed. Parents should be informed of these options so they can choose the most convenient or appropriate form based on their needs.
Correct Answer is D
Explanation
Choice A rationale:
One ounce is equivalent to 29.57 ml (30 mls when rounded off to the nearest whole number). This conversion is essential in pediatric care, especially when administering medications to infants, as doses are often prescribed in milliliters.
Choice B rationale:
One ounce is equivalent to 29.57 ml (30 mls when rounded off to the nearest whole number). This conversion is essential in pediatric care, especially when administering medications to infants, as doses are often prescribed in milliliters.
Choice C rationale:
One ounce is equivalent to 29.57 ml (30 mls when rounded off to the nearest whole number). This conversion is essential in pediatric care, especially when administering medications to infants, as doses are often prescribed in milliliters.
Choice D rationale:
One ounce is equivalent to 29.57 ml (30 mls when rounded off to the nearest whole number). This conversion is essential in pediatric care, especially when administering medications to infants, as doses are often prescribed in milliliters.
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