DATE:TOPIC:MARKs:1. Which of the following is NOT a function of the digestive system?

a. ingest foodb. digest food to small moleculesc. absorb nutrient moleculesd. eliminate non-digestible wastese. transport nutrients to other organs

2. Why is digestion of food important

a. to allow the liver to produce bile for digestionb. to allow the pancreas to release digestive enzymesc. to allow small molecules to cross cell membranes and be absorbed by the tract liningd. to allow large molecules to cross cell membranes and be absorbed by the tract lininge. to allow the meat that is eaten to nourish our body

3. Strictly speaking, ____ refers to the breakdown of food by enzymatic action.

a. ingestionb. digestionc. excretiond. metabolisme. mastication

4. Which of the following statements is NOT correct?a. Digestion only takes place within the digestive tract.b. The digestive tract begins with the mouth and ends with the anus.c. Digestion of food in humans is a process that occurs inside of cells.d. Digestive enzymes are secreted into the tract by glands located either in the tract or nearby.e. Food is never found within accessory glands, only within the tract itself.

5. True or False. Taste is largely due to stimulation of receptors in the nose.

6. Which of the following sequences does NOT trace the path of food through the digestive tract correctly?

a. mouth, esophagus, stomachb. esophagus, stomach, duodenumc. stomach, large intestine, small intestined. stomach, duodenum, large intestinee. ascending colon, transverse colon, descending colon

7. ____ are chisel-shaped teeth used for biting.

a. Incisorsb. Caninesc. Premolarsd. Molarse. Wisdom teeth

8. Which of the following comparisons is NOT correct?

a. stomach--food storage and grindingb. esophagus--food conductionc. pharynx--side route to the lungsd. small intestine--food processinge. large intestine--water and salt processing

9. Which of the following comparisons is NOT correct?

a. bolus--food mixed with saliva in the mouthb. chyme--food mixed with gastric secretions leaving the stomachc. gastric juice--secretions from intestinal glandsd. feces-nondigestible remains, bile, and bacteriae. peristalsis--rhythmic contractions to move food

10. True or False. Sphincters are muscles that encircle tubes and act as valves.

11. Which of the following hormones will cause the stomach to churn and increase secretory activity of the gastric glands

a. GIPb. gastrinc. secretind. CCKe. insulin

12. Which of the following hormones is/are produced by cells of the duodenal wall?

a. gastrin aloneb. GIP alonec. secretin aloned. CCK alonee. secretin and CCK

13. True or False. If hydrochloric acid penetrates the mucus on the stomach wall, autodigestion of the wall begins, and an ulcer results.

14. Which of the following substances will cause the release of secretin from the duodenal wall?

a. carbohydratesb. fatsc. partially digested proteind. hydrochloric acid in chymee. sodium hydroxide in chyme

15. Which sphincter allows chyme to enter the small intestine?

a. esophageal sphincterb. pyloric sphincterc. anal sphincterd. lacteale. ileocecal valve

16. Which organ will secrete sodium bicarbonate to neutralize the acidity of chyme in the small intestine?

a. pancreasb. gallbladderc. duodenumd. esophaguse. stomach

17. Where are the brush-border enzymes found?

a. villib. microvillic. columnar epithelial cellsd. goblet cellse. lacteal

18. True or False. All end products of lipid, protein, and carbohydrate digestion enter the blood capillaries of the villi.

19. Which of the following statements is NOT correct?a. Microvilli increase the surface area of the small intestine for absorption of nutrients.b. Enzymes located on the brush-border finish the digestion of chyme.c. Absorption is an active process in the small intestine.d. Sugars and amino acids cross columnar epithelial cells to enter the lacteal.e. Fat components rejoin in epithelial cells and are packaged as lipoprotein droplets, which enter the lacteals.

20. Which of the following organs will contain villi?

a. esophagusb. stomachc. small intestined. livere. pancreas

21. True or False. Most bacteria that live in the colon are facultative bacteria.

22. Which of the following organs is NOT part of the large intestine?

a. cecumb. colonc. rectumd. anal canale. duodenum

23. Which of the following organs functions to absorb water, salts, and store nondigestible material?

a. esophagusb. stomachc. small intestined. large intestinee. liver

24. Which of the following organs is considered an accessory organ of digestion?

a. liverb. stomachc. esophagusd. ascending colone. rectum

25. Which of the following organs has both an endocrine and an exocrine function?

a. pancreasb. liverc. stomachd. duodenume. esophagus

26. Which of the following organs produces bile?

a. gallbladderb. liverc. duodenumd. stomache. large intestine

27. Which component in bile helps to emulsify fat in the duodenum?

a. bilirubinb. biliverdinc. bile saltsd. cholesterol

28. Which blood vessel will transport nutrient molecules that have been absorbed by the small intestine to the liver?

a. hepatic arteryb. hepatic veinc. hepatic portal arteryd. hepatic portal veine. inferior vena cava

29. Which of the following organs functions to remove poisonous substances and works to keep the contents of blood constant?

a. esophagusb. stomachc. duodenumd. pancrease. liver

30. True or False. Before amino acids can be converted to glucose molecules in the liver, deamination must take place.

31. Which of the following is NOT a function of the liver?a. converts hemoglobin from red blood cells to bile pigments that are excreted along with bile salts in bileb. detoxifies blood by removing poisonous substancesc. produces urea from the breakdown of amino acidsd. produces enzymes for digestion of food in the duodenume. makes plasma (blood) proteins from amino acids

32. Which of the following statements is NOT true about digestive enzymes?a. Digestive enzymes are hydrolytic enzymes.b. Digestive enzymes are carbohydrates that have a particular shape that fits their substrate.c. Digestive enzymes have an optimum pH which maintains their shape.d. Digestive enzymes speed up a chemical reaction.e. Each digestive enzyme speeds up a specific reaction.

33. Which of the following organs will NOT produce any digestive enzymes?

a. salivary glandsb. stomachc. esophagusd. duodenume. pancreas

34. Which of the following enzymes will have an optimum pH that is acidic?

a. salivary amylaseb. pepsinc. pancreatic amylased. trypsine. lipase

35. Which of the following statements is NOT correct about fat digestion?a. Bile salts are needed to emulsify fat into fat droplets.b. Lipase digests the fat droplets into glycerol and fatty acid molecules while removing water molecules.c. Glycerol and fatty acids enter the cells of the villi.d. Glycerol and fatty acids, after entering the cells of the villi, rejoin and are packaged as lipoprotein droplets.e. Lipoprotein droplets, which are formed in the cells of the villi, enter the lacteals.

36. Which of the following enzymes is found on the mucosa of the intestinal villi?

a. amylaseb. trypsinc. peptidased. lipasee. pepsin

37. Which of the following enzymes is released from the gastric glands to break down proteins into peptides?

a. lipaseb. pancreatic amylasec. trypsind. pepsine. peptidase

38. Which enzyme breaks down starch to maltose in the duodenum?

a. lipaseb. trypsinc. maltased. salivary amylasee. pancreatic amylase

39. Which of the following relationships is NOT correct? (Enzyme / Produced by)

a. pepsin / gastric glandsb. maltase / pancreasc. salivary amylase / salivary glandsd. trypsin / pancrease. peptidases / villi of small intestine

40. When starch is broken down by pancreatic amylase, ____ will be formed.

a. glycerol + fatty acidsb. amino acidsc. peptidesd. maltosee. glucose

41. When peptides are broken down by peptidases, ____ will be formed.

a. amino acidsb. fatty acids and glycerolc. glucosed. proteinse. maltose

42. Pepsinogen is converted to pepsin in the stomach when exposed to ____.

a. trypsinb. hydrochloric acidc. peptidesd. peptidasese. lipase

43. Which of the following substances is NOT a product formed in the smallintestine?

a. glucoseb. maltosec. amino acidsd. peptidese. proteins

44. Which enzyme is missing in the small intestine if a person has lactose intolerance?

a. pancreatic amylaseb. dipeptidasec. lipased. lactasee. maltase

45. When fats are broken down by lipase, ____ will be formed.

a. amino acidsb. fatty acids and glycerolc. glucosed. proteinse. maltose

46. Which of the following comparisons is NOT correct?

a. fats -- lipaseb. starch -- salivary amylasec. maltose -- lactased. protein -- trypsine. peptides -- dipeptidases

47. Which of the following enzymes would NOT be used to break down spaghetti into its end products for absorption?

a. salivary amylaseb. pancreatic amylasec. maltased. lipase

48. Five test tubes, listed below, were incubated at body temperature for one hour. Which of the following test tubes would have the appropriate environmental conditions for digestion to occur?

a. H2O + a small sliver of egg white (protein)b. Pepsin + H2O + a small sliver of egg whitec. HCl + H2O + a small sliver of egg whited. Pepsin + HCl + H2O + a small sliver of egg whitee. Pepsin + NaOH + H2O + a small sliver of egg white

49. Five test tubes, listed below, were incubated at body temperature for one hour. Which of the following test tubes would be considered the control?

a. H2O + a small sliver of egg white (protein)b. Pepsin + H2O + a small sliver of egg whitec. HCl + H2O + a small sliver of egg whited. Pepsin + HCl + H2O + a small sliver of egg whitee. Pepsin + NaOH + H2O + a small sliver of egg white

Digestive System Self Test Answer Key1. E 2. C 3. B 4. C 5. T 6. C 7. A 8. C 9. C 10. T11. B 12. E 13. T 14. D 15. B 16. A 17. B 18. F 19. D 20. C21. F 22. E 23. D 24. A 25. A 26. B 27. C 28. D 29. E 30. T31. D 32. B 33. C 34. B 35. B 36. C 37. D 38. E 39. B 40. D41. A 42. B 43. E 44. D 45. B 46. C 47. D 48. D 49. Ahttp://msjclassbio12.blogspot.in/p/digestive-system.html

Digestive System Pretest Answers: 1)C 2)B 3)C 4)B 5)D 6)C 7)A 8)C 9)B 10)G 11)D 12)A 13)E 14)B 15)B