The nurse is performing a newborn physical assessment and is about to elicit the Moro reﬂex. Which of the following responses should the nurse expect to see?
Select one:

The cheek of the newborn is touched, and the newborn turns toward the side that was touched.

The newborn is suddenly lowered or startled, and they extend their arms, legs and neck, then rapidly bring their arms together.

The newborn is supine and their head is turned to one side, then the arm on that same side extends.

The lateral aspect of the sole of the newborn's foot is stroked, and the toes extend and fan outward.

Answer and Explanation

The Correct Answer is B

Choice A Reason: The cheek of the newborn is touched, and the newborn turns toward the side that was touched. This is an incorrect answer that describes a diﬀerent reﬂex called the rooting reﬂex. The rooting reﬂex is a feeding reﬂex that helps the newborn locate the nipple and initiate sucking. The rooting reﬂex is elicited by stroking the cheek or corner of the mouth of the newborn, which causes them to turn their head and open their mouth toward the stimulus.

Choice B Reason: The newborn is suddenly lowered or startled, and they extend their arms, legs and neck, then rapidly bring their arms together. This is because this response describes the Moro reﬂex, which is a primitive reﬂex that is present at birth and disappears by 3 to 6 months of age. The Moro reﬂex is elicited by simulating a falling sensation or a loud noise, which triggers a fear response in the newborn. The Moro reﬂex consists of four phases: extension, abduction, adduction, and crying.

Choice C Reason: The newborn is supine and their head is turned to one side, then the arm on that same side extends. This is an incorrect answer that refers to another reﬂex called the tonic neck reﬂex. The tonic neck reﬂex is a postural reﬂex that helps prepare the newborn for voluntary reaching. The tonic neck reﬂex is elicited by placing the newborn in a supine position and turning their head to one side, which causes them to assume a "fencing" posture with one arm extended and one arm ﬂexed.

Choice D Reason: The lateral aspect of the sole of the newborn's foot is stroked, and the toes extend and fan outward. This is an incorrect answer that indicates a diﬀerent reﬂex called the Babinski reﬂex. The Babinski reﬂex is a neurological reﬂex that tests for spinal cord integrity. The Babinski reﬂex is elicited by stroking the lateral aspect of the sole of the foot from heel to toe, which causes the big toe to dorsiﬂex and the other toes to fan out.

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Correct Answer is A

Explanation

Choice A Reason: Grunting and nasal ﬂaring. These are signs of respiratory distress in newborns, which indicate that their oxygenation needs are not being met. Grunting and nasal ﬂaring. This is because grunting and nasal ﬂaring are signs of respiratory distress in newborns, which indicate inadequate oxygenation and ventilation. Grunting is a noise made by the newborn when exhaling, which reﬂects an atempt to keep the alveoli open and increase lung volume.

Nasal ﬂaring is a widening of the nostrils when inhaling, which reﬂects an eﬀort to reduce airway resistance and increase airﬂow.

Choice B Reason: Acrocyanosis. This is not a sign of respiratory distress in newborns, but rather a common condition called acrocyanosis. Acrocyanosis means bluish discoloration of the hands and feet due to poor peripheral circulation in response to cold exposure or stress. It does not aﬀect oxygenation or ventilation and usually disappears within 24 to 48 hours after birth.

Choice C Reason: Abdominal breathing. This is not a sign of respiratory distress in newborns, but rather a normal patern of breathing for them. Abdominal breathing means that the newborn's abdomen rises and falls with each breath, which reﬂects the use of the diaphragm as the primary respiratory muscle.

Choice D Reason: Respiratory rate of 54 breaths/minute. This is not a sign of respiratory distress in newborns, but rather a normal range of respiratory rate for them. A normal respiratory rate for a newborn ranges from 40 to 60 breaths per minute.

A. Two arteries, one vein. B. Two veins, one artery. C. Two veins, two arteries. D. One artery, one vein.

Correct Answer is A

Explanation

Choice A Reason: Two arteries, one vein. This is because two arteries and one vein are the normal components of the umbilical cord, which is a structure that connects the fetus to the placenta and provides blood circulation between them. The umbilical cord carries oxygenated blood from the placenta to the fetus through the umbilical vein, and deoxygenated blood from the fetus to the placenta through the umbilical arteries.

Choice B Reason: Two veins, one artery. This is an incorrect answer that indicates an abnormal anatomy of the umbilical cord, which is known as single umbilical artery (SUA). SUA is a condition where there is only one umbilical artery instead of two, which can reduce blood ﬂow and oxygen delivery to the fetus. SUA can be associated with congenital anomalies or growth restriction in some cases.

Choice C Reason: Two veins, two arteries. This is an incorrect answer that indicates an abnormal anatomy of the umbilical cord, which is known as double umbilical vein (DUV). DUV is a condition where there are two umbilical veins instead of one, which can increase blood ﬂow and oxygen delivery to the fetus. DUV can be associated with fetal overgrowth or polycythemia in some cases.

Choice D Reason: One artery, one vein. This is an incorrect answer that indicates an abnormal anatomy of the umbilical cord, which is also known as single umbilical artery (SUA). SUA is a condition where there is only one umbilical artery instead of two, which can reduce blood ﬂow and oxygen delivery to the fetus. SUA can be associated with congenital anomalies or growth restriction in some cases.

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The nurse is performing a newborn physical assessment and is about to elicit the Moro reﬂex. Which of the following responses should the nurse expect to see? Select one:

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The nurse is performing a newborn physical assessment and is about to elicit the Moro reﬂex. Which of the following responses should the nurse expect to see?
Select one: