12. Involuntary muscle contractions move food 18. Which of the following organs does not through the intestinal tract. The movement contribute juices during digestion? that forces the contents back a few inches a. salivary glands before pushing it forward again is called: b. intestine a. segmentation. c. pancreas b. rotation. d. esophagus c. peristalsis. d. liquefaction. 19. The function of mucus in the stomach is to: a. neutralize stomach acid. 13. Enzymes: b. activate pepsinogen to pepsin. a. facilitate chemical reactions. c. protect stomach cells from gastric juices. b. draw water into the small intestine. d. emulsify fats. c. are present in all parts of the GI tract. e. collect bacteria. d. encourage bacterial growth. 20. The major digestive work in the stomach is 14. Which enzyme breaks down starch in the the initial breakdown of: mouth? a. starch. a. lingual protease b. proteins. b. lipase c. fat. c. salivary amylase d. vitamins. d. gastric protease e. secretin 21. In addition to hydrochloric acid, the stomach cells also secrete: 15. Saliva contains an enzyme that digests: a. mucus. a. proteins. b. bile. b. minerals. c. amylase. c. starches. d. lipoproteins. d. vitamins. e. cholesterol. e. 22. The major digestive enzyme secreted by the 16. Which of the following is not a component stomach is: of gastric juice? a. amylase. a. water b. lipase. b. enzymes c. pepsin. c. chylomicrons d. disaccharidase. d. hydrochloric acid 23. Which nutrients are digested in the small 17. The normal pH of the stomach is: intestine? a. very acidic. a. carbohydrate, fat, and protein b. slightly acidic. b. fat, water, and fiber c. neutral. c. protein, vitamins, and fiber d. slightly alkaline. d. water, fiber, and minerals e. strongly alkaline.
12. Involuntary muscle contractions move food through the intestinal tract. The movement that forces the contents back a few inches before pushing it forward again is called: a. segmentation. b. rotation. c. peristalsis. d. liquefaction. 13. Enzymes: a. facilitate chemical reactions. b. draw water into the small intestine. c. are present in all parts of the GI tract. d. encourage bacterial growth. 14. Which enzyme breaks down starch in the mouth? a. lingual protease b. lipase c. salivary amylase d. gastric protease e. secretin 15. Saliva contains an enzyme that digests: a. proteins. b. minerals. c. starches. d. vitamins. e. 16. Which of the following is not a component of gastric juice? a. water b. enzymes c. chylomicrons d. hydrochloric acid 17. The normal pH of the stomach is: a. very acidic. b. slightly acidic. c. neutral. d. slightly alkaline. e. strongly alkaline. 18. Which of the following organs does not contribute juices during digestion? a. salivary glands b. intestine c. pancreas d. esophagus 19. The function of mucus in the stomach is to: a. neutralize stomach acid. b. activate pepsinogen to pepsin. c. protect stomach cells from gastric juices. d. emulsify fats. e. collect bacteria. 20. The major digestive work in the stomach is the initial breakdown of: a. starch. b. proteins. c. fat. d. vitamins. 21. In addition to hydrochloric acid, the stomach cells also secrete: a. mucus. b. bile. c. amylase. d. lipoproteins. e. cholesterol. 22. The major digestive enzyme secreted by the stomach is: a. amylase. b. lipase. c. pepsin. d. disaccharidase. 23. Which nutrients are digested in the small intestine? a. carbohydrate, fat, and protein b. fat, water, and fiber c. protein, vitamins, and fiber d. water, fiber, and minerals