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MMLU / A 27-year-old man is admitted to the hospital 45 minutes after being involved in…

Problem

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question

A 27-year-old man is admitted to the hospital 45 minutes after being involved in a motor vehicle collision. Physical examination shows a sluggish response to stimuli. Neurologic examination shows no other abnormalities. A skull x-ray shows a linear, nondepressed basal skull fracture. Two weeks later, the patient develops polyuria and polydipsia. Laboratory studies show a serum glucose concentration within the reference range, increased serum osmolality, and decreased urine osmolality. Following the administration of desmopressin, urine osmolality increases. The beneficial effect of this drug is most likely due to activation of which of the following?

choices

  1. Adenylyl cyclase
  2. Ca2+ channels
  3. Janus kinase
  4. Serine kinase

subject

professional_medicine

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