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SECTION IV. GASTROINTESTINAL PHYSIOLOGY

Water is absorbed in the jejunum, ileum, and colon and excreted in the feces. Arrange these in order of the amount of water absorbed or excreted from greatest to smallest.

A. Colon, jejunum, ileum, feces

B. Feces, colon, ileum, jejunum

C. Jejunum, ileum, colon, feces

D. Colon, ileum, jejunum, feces

E. Feces, jejunum, ileum, colon

Following a natural disaster in Haiti, there is an outbreak of cholera among displaced persons living in a tent encampment. The affected individuals display severe diarrheal symptoms because of which of the following changes in intestinal transport?

A. Increased Na+–K+ cotransport in the small intestine

B. Increased K+ secretion into the colon

C. Reduced K+ absorption in the crypts of Lieberkühn

D. Increased Na+ absorption in the small intestine

E. Increased Cl secretion into the intestinal lumen

A 50-year-old man comes to see his clinician complaining of severe epigastric pain, frequent heartburn, and unexplained weight loss of 20 pounds over a 6-month period. He claims to have obtained no relief from over-the-counter H2 antihistamine drugs. He is referred to a gastroenterologist, and upper endoscopy reveals erosions and ulcerations in the proximal duodenum and an increased output of gastric acid in the fasting state. The patient is most likely to have a tumor secreting which of the following hormones?

A. Secretin

B. Somatostatin

C. Motilin

D. Gastrin

E. Cholecystokinin

Which of the following has the highest pH?

A. Gastric juice

B. Colonic luminal contents

C. Pancreatic juice

D. Saliva

E. Contents of the intestinal crypts

A 60-year-old woman undergoes total pancreatectomy because of the presence of a tumor. Which of the following outcomes would not be expected after she recovers from the operation?

A. Steatorrhea

B. Hyperglycemia

C. Metabolic acidosis

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