Chapter 25: Overview of Gastrointestinal Function & Regulation

Chapter 25. Overview of Gastrointestinal Function & Regulation

A researcher conducts a study of the regulation of salivary secretion in a group of volunteer medical students under various conditions. Which of the following conditions would be expected to be associated with the lowest rates of secretion?

A. Chewing gum

B. Undergoing a mock dental exam

C. Sleep

D. Exposure to a nauseating odor

E. Resting control conditions

A patient suffering from anemia comes to his physician complaining of frequent bouts of gastroenteritis. A blood test reveals antibodies directed against gastric parietal cells. The anemia in this patient is attributable to hyposecretion of which gastric product?

A. Histamine

B. Gastrin

C. Pepsinogen

D. Intrinsic factor

E. Hydrochloric acid

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

D. Weight gain

E. Decreased absorption of amino acids