Correct Answer: B

Rationale: The correct answer is B. Myelination occurs in a cephalocaudal (head-to-toe) pattern, improving nerve function progressively. Choice A is incorrect because myelination continues beyond 4 years of age and into adolescence. Choice C is incorrect as myelination speeds up nerve impulses rather than slowing them down. Choice D is incorrect because myelination increases the specificity and efficiency of nerve impulses, making them more focused and precise.

Correct Answer: C

Rationale: The correct clinical manifestation that a nurse is likely to observe in a child with suspected intussusception is abdominal distension. Intussusception is a medical emergency where a part of the intestine folds into itself, causing obstruction. Abdominal distension is a common symptom due to the obstruction and the build-up of gases and fluids. While currant jelly stools (Choice B) are a classic sign of intussusception, they are typically seen in later stages of the condition and may not be present during the initial assessment. Projectile vomiting (Choice A) is more commonly associated with conditions like pyloric stenosis. Constipation (Choice D) is not a typical manifestation of intussusception; the condition usually presents with severe colicky abdominal pain and possible passage of blood and mucus in stools.

Correct Answer: A

Rationale: The priority nursing intervention for a child with acute lymphoblastic leukemia (ALL) receiving chemotherapy is to prevent infection. Chemotherapy compromises the child's immune system, increasing susceptibility to infections. Preventing infection is crucial to avoid potential complications such as sepsis, which can be life-threatening. Administering chemotherapy is essential for treating ALL but preventing infection takes precedence due to the increased risk of infections associated with chemotherapy-induced immunosuppression. Providing nutritional support is important for overall health but preventing infections is more critical in this context. Monitoring fluid intake is significant, but the priority is to prevent infections that can have severe consequences in an immunocompromised child.

Correct Answer: C

Rationale: The correct clinical manifestation the healthcare provider is likely to observe in a child with suspected intussusception is abdominal distension. Intussusception involves one portion of the intestine telescoping into another, causing obstruction. Abdominal distension is a common symptom due to the obstruction and buildup of gas and fluid in the affected area. While projectile vomiting can occur, it is not as specific to intussusception as abdominal distension. Currant jelly stools, which are stools containing blood and mucus, are a classic sign of intussusception but are not a clinical manifestation observable on assessment. Constipation is not typically associated with intussusception, as this condition often presents with symptoms of bowel obstruction rather than constipation.

Correct Answer: B

Rationale: When managing a child with partial thickness burns over the upper body areas, the priority action during the primary survey is to assess for a patent airway. This step is crucial as burns in this region can lead to airway compromise, potentially causing rapid deterioration in the child's condition. Checking for a patent airway ensures that the child can breathe adequately, which is essential for oxygenation and ventilation. Inspecting the child's skin color (Choice A) is an important assessment but should follow ensuring a patent airway. Observing for symmetric breathing (Choice C) is relevant, but the immediate focus should be on securing the airway. Palpating the child's pulse (Choice D) is also a vital assessment, but in this scenario, the priority is to assess and maintain a clear airway to support respiratory function and oxygen delivery.