Correct Answer: B

Rationale: The primary function of the endocrine system is hormonal secretion. This system is responsible for producing and releasing hormones that regulate various bodily functions such as growth, metabolism, and mood. Choice A, regulation of water balance, is more related to the functions of the renal system rather than the endocrine system. Choice C, cellular metabolism, is a general cellular process that involves various systems, not specific to the endocrine system. Choice D, growth stimulation, though hormones can influence growth, it is not the primary function of the endocrine system. Therefore, the correct answer is B.

Correct Answer: B

Rationale: Invasive burn cellulitis is characterized by the burn developing a dark brown, black, or purplish color with discharge and a foul odor. This description aligns with the symptoms observed in the 15-year-old boy. Burn wound cellulitis (Choice A) typically presents with erythema, edema, warmth, and tenderness at the burn site, without the characteristic changes seen in this case. Burn impetigo (Choice C) is a superficial infection characterized by honey-colored crusts, not consistent with the purplish color and foul odor described. Staphylococcal scalded skin syndrome (Choice D) is a condition caused by exotoxins produced by Staphylococcus aureus, leading to widespread desquamation of the skin, but it does not typically present with the specific findings mentioned in the scenario.

Correct Answer: C

Rationale: Circumoral cyanosis should alert the nurse to perform further assessment in a 2-month-old infant with Down syndrome. This finding may indicate cardiac or respiratory issues, such as inadequate oxygenation. Small, low-set ears and a protruding furrowed tongue are common physical characteristics associated with Down syndrome and may not necessarily warrant immediate further assessment. A flat occiput is a normal variation in infant anatomy and is not typically a cause for immediate concern in this context.

Correct Answer: C

Rationale: Choice C indicates a need for further teaching because not all products are clearly labeled as latex-free. It is essential for the mother to understand that she should not solely rely on product labels to determine latex content. She should be encouraged to verify with manufacturers and consult healthcare providers for accurate information. Choices A, B, and D are correct responses. Wearing a medical alert identification, informing caregivers, and ensuring the boy avoids all contact with latex are crucial steps in managing his sensitivity to latex and preventing potential allergic reactions.

Correct Answer: D

Rationale: Surgical repair of patent ductus arteriosus (PDA) aims to prevent increased pulmonary vascular congestion, which can lead to congestive heart failure and respiratory distress. Choice A, pulmonary infection, is not a direct complication of PDA but rather a result of other factors. Choice B, right-to-left shunt of blood, is a characteristic of a different heart condition (e.g., Tetralogy of Fallot) and not specifically associated with PDA. Choice C, decreased workload on the left side of the heart, is not a typical complication of PDA but rather a consequence of left-to-right shunting that can cause volume overload in the pulmonary circulation.