A Previously Healthy 20-Year-Old Man Is Brought to the Emergency

A previously healthy 20-year-old man is brought to the emergency department because of a 36-hour history of fever and profuse, watery diarrhea. He appears lethargic. His temperature is 38.1°C (100.6°F) , pulse is 115/min, respirations are 25/min, and blood pressure is 90/58 mm Hg. Examination shows sunken eyes and dry mucous membranes. Capillary refill time is 3 seconds. Abdominal examination shows no abnormalities.  Which of the following physiologic changes in kidney function would be most likely in this patient?

A) Decreased chloride reabsorption
B) Decreased sodium reabsorption
C) Decreased urine osmolality
D) Increased renal blood flow
E) Increased tubular hydrostatic pressure
F) Increased urea reabsorption

Correct Answer:

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