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
Explanation
Rooting. Choice A rationale:
The Moro reflex is a startle reflex characterized by the infant's sudden extension and abduction of the arms in response to a loud noise or sudden movement. It is not involved in the initiation of sucking and is unrelated to breastfeeding.
Choice B rationale:
The rooting reflex is a crucial reflex that helps initiate sucking in newborns. When the infant's cheek is stroked or touched, they will turn their head toward the stimulus and open their mouth, preparing for feeding. This reflex helps the infant find the mother's nipple and begin breastfeeding effectively.
Choice C rationale:
The stepping reflex is a primitive reflex observed in newborns when held upright with their feet touching a solid surface. The baby will make stepping movements, mimicking walking. However, this reflex is not related to the initiation of sucking and breastfeeding.
Choice D rationale:
The Babinski reflex is a reflex in which the big toe extends upward and the other toes fan out when the sole of the foot is stimulated. This reflex is present in newborns and disappears as the child grows older. It is not involved in the initiation of sucking.
Correct Answer is D
Explanation
Choice A rationale:
15 mL is not the correct choice because it only considers the first two feedings and does not account for the intake during the entire shift.
Choice B rationale:
30 mL is not the correct choice because it only considers the first three feedings and does not account for the intake during the entire shift.
Choice C rationale:
45 mL is not the correct choice because it only considers the first four feedings and does not account for the intake during the entire shift.
Choice D rationale:
The nurse should record 60 mL of formula as the newborn's intake for the shift. To calculate the total intake, you add the amounts from each feeding: 0.5 oz + 1 oz + 0.5 oz + 0.5 oz + 0.5 oz = 60 mL. Remember that 1 fluid ounce (oz) is approximately equal to 30 mL.
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