Guided Reading - The Digestive System I
1. "Traveler's diarrhea" results when
A. enterogastrone secretion is inhibited.
B. gastrointestinal motility is stimulated by increased parasympathetic outflow.
C. guanylin receptors in the ileum and colon are stimulated by enterotoxins.
D. cholecystokinin secretion is inhibited.
2. The first of the three phases of extrinsic control of gastric function is the gastric phase.
3. Which of the following is NOT a function of the stomach?
A. store food
B. kill bacteria
C. digestion of most foods
D. move chyme into the duodenum
4. Which of the following processes is NOT a liver function?
C. hydrolysis of sucrose
5. The combination of chewed food and saliva is called
B. a bolus.
6. Which tunic of the GI tract is very vascular and has many nerves and glands?
7. The intrinsic regulation of the GI tract is conferred by the autonomic nervous system.
8. __________ is a condition in which large number of liver lobules are destroyed and replaced by permanent,
scar-like connective tissue.
9. The conjugation of nonpolar compounds in the liver makes them _____ and water _____.
A. polar; soluble
B. polar; insoluble
C. cationic; soluble
D. cationic; insoluble
10. Wavelike muscular contraction of the gastrointestinal tract is called
11. What is the function of enterokinase secreted by the brush border?
A. activates the protein-digesting enzyme trypsin
B. breaks down dipeptides
C. causes the stomach to produce gastrin
D. causes release of pancreatic digestive enzymes
12. What allows the intestinal microbiota to live in the large intestine?
A. protection by innate and adaptive immune systems
B. the anaerobic environment
C. availability of nutrients
D. All of the choices are correct.
13. Normal levels of intestinal microbiota help protect us from pathogenic bacteria.
14. Active transport of Na
into intestinal cells allows the osmosis of water.
15. Mutating the gene encoding for the H
ATPase would block gastric HCl secretion.
16. Excess use of antibiotics can kill the normal intestinal microflora, increasing inflammation by pathogenic
17. Somatostatin is produced in the stomach by
A. goblet cells.
B. parietal cells.
C. G cells.
D. D cells.
18. A _____________ has the following pattern of circulation: capillaries -> veins -> capillaries -> veins.
A. portal system
19. What commonly ingested substances are absorbed through the stomach wall?
A. water and alcohol
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