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A 7-year-old male presents with loose watery stools. His condition started with abdominal pain. After a few hours he started to have vomiting and loose watery stools characterized as brownish, non-foul smelling, non-bloody about 1/2 cup per bout 3 to 4 episodes per day. His classmates also have similar symptoms. The vital signs shows a blood pressure of 100/60 mmHg, temperature 37.9 C (100.22 F), cardiac rate 105/min, and a respiratory rate of 25 breaths/min. The physical exam shows slightly sunken eyeballs, dry lips, hyperactive bowel sounds, slight tenderness on the epigastric area, good peripheral pulses, and a capillary refill time of 2 seconds. The complete blood count shows hemoglobin 13 mg/dL, hematocrit 40%, WBC 14 mg/dL, segmenters 60%, lymphocytes 40%, and platelet count of 200,000 microliters. Serum electrolytes show sodium of 135 mmol/L, potassium 3.0 mmol/L, chloride 100 mmol/L, and calcium of 10 mg/dL. Which of the following structures will have histopathological changes due to the cause of his condition?

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