Correct Answer: D

Rationale: The correct answer is D - Shallow breathing and increasing lethargy. This could indicate a potential complication such as respiratory distress or postoperative infection. Shallow breathing may suggest respiratory compromise, while increasing lethargy could be a sign of systemic infection or inadequate oxygenation. A: Abdominal pain is common postoperatively and can be managed with pain medication. B: Serous drainage from the incision is normal and expected in the early postoperative period. C: Hypoactive bowel sounds are common after abdominal surgery due to anesthesia and manipulation of the bowel; it typically resolves as the patient recovers. In summary, the other options are common postoperative findings, while shallow breathing and increasing lethargy are concerning signs that require immediate attention.

Correct Answer: C

Rationale: The correct answer is C because a decreased number of functioning acetylcholine receptor sites would result in the disease. Acetylcholine is a neurotransmitter that transmits signals between nerves and muscles. If there are fewer receptor sites for acetylcholine to bind to, this can lead to impaired nerve-muscle communication, causing the disease. Choice A is incorrect because a genetic defect in acetylcholine production would not directly affect the receptor sites. Choice B is incorrect because a reduced amount of acetylcholine would still be able to bind to the available receptor sites. Choice D is incorrect because inhibiting the enzyme Ache would not directly impact the receptor sites.

Correct Answer: C

Rationale: The correct answer is C: 125 mL/h. To calculate the infusion rate per hour, we divide the total volume (1000 mL) by the total time in hours (8 hours). 1000 mL / 8 hours = 125 mL/h. This ensures a consistent and accurate infusion rate throughout the 8-hour period. Choice A (80 mL/h) is incorrect because it underestimates the infusion rate. Choice B (100 mL/h) is incorrect because it does not divide the total volume by the total time correctly. Choice D (150 mL/h) is incorrect because it overestimates the infusion rate.

Correct Answer: A

Rationale: The correct answer is A, the 50-year-old with an ileostomy, should be monitored most closely for dehydration. Patients with an ileostomy have a higher risk of dehydration due to increased fluid loss through the stoma. Monitoring their fluid intake, output, electrolyte levels, and signs of dehydration is crucial to prevent complications. The other choices are less likely to experience severe dehydration compared to the patient with an ileostomy. The 72-year-old with diabetes mellitus may be at risk for dehydration, but it is not as high a risk as the patient with an ileostomy. The 19-year-old with chronic asthma and the 28-year-old with a broken femur are not as directly related to dehydration compared to the patient with an ileostomy.

Correct Answer: C

Rationale: The correct answer is C (280 to 295mOsm/kg) because serum osmolality is primarily determined by sodium, glucose, and blood urea nitrogen levels. Normal serum sodium range is 135-145 mEq/L, which corresponds to an osmolality range of 280-295 mOsm/kg. Choices A and B are incorrect as they do not align with normal serum sodium levels. Choice D is incorrect as it includes an excessively wide range that is not consistent with normal osmolality values.