Digestive System

1. Which of the following is NOT a digestive enzyme?
 Pepsin.
 Ptyalin.
 Gastrin.
 Trypsin.

2. The presence of large numbers of mitochondria in the cells which line the small intestine allow it to
 engulf fats.
 digest proteins.
 absorb glucose.
 synthesize vitamins.

3. The function of the gall bladder is to
 store bile.
 synthesize lipids.
 produce enzymes.
 stimulate the release of pancreatic juice.

4. The bacterium E. coli is normally found in large numbers in
 food.
 feces.
 bile salts.
 stomach juices.

5. Which of the following digestive enzymes is NOT correctly matched with its substrate?
 Lipase – fat.
 Pepsin – protein.
 Trypsin – nucleic acid.
 Salivary amylase – starch.

6. Glucose is stored in the liver as
 fat.
 starch.
 protein.
 glycogen.

7. The part of the digestive tract where starch first undergoes chemical digestion is the
 mouth.
 stomach.
 small intestine.
 large intestine.

8. The release of insulin is TRIGGERED by
 low levels of blood sugar.
 high levels of blood sugar.
 low amounts of sugar in one’s diet.
 high amounts of sugar in one’s diet.

9. Which of the following is absorbed into lacteals?
 Glucose.
 Fatty acids.
 Nucleotides.
 Amino acids.

10. The absorption of digested food products occurs primarily in the
 liver.
 stomach.
 large intestine.
 small intestine.

11. Which structure is the appendix attached to?
 The stomach.
 The gall bladder.
 The large intestine.
 The small intestine.

12. In which combination of organs does the digestion of carbohydrates occur?
 Mouth and large intestine.
 Mouth and small intestine.
 Mouth, stomach and pancreas.
 Mouth, stomach, small intestine.

13. Which region has openings for both the trachea and esophagus?
 Throat.
 Pharynx.
 Stomach.
 Epiglottis.

Use the following diagram to answer the next question.



14. Which of the following will enter the structure labeled X?
 Lipids.
 Glucose.
 Nucleotides.
 Amino acids.

15. If pancreatic juice was added to a chopped up deluxe hamburger and allowed to soak for 24 hours, which of the following would most likely be present?
 Monosaccharides and polypeptides.
 Amino acids, glucose, and fatty acids.
 Nucleotides, glucose and amino acids.
 Fatty acids, polypeptides, glycerol and maltose.

16. Which of the following correctly matches a digestive enzyme with its source?
 Pepsin - pancreas.
 Bile - gall bladder.
 Trypsin - stomach.
 Amylase - pancreas.

17. Given the correct enzyme for the following reaction, product X could represent

fat + H₂0 X + Y

 peptides.
 fatty acids.
 nucleotides.
 amino acids.

Use the following diagram to answer the next two questions.



18. Which organ releases an enzyme that digests fats?
 W
 X
 Y
 Z

19. Which organ functions to store food, kill bacteria, and digest protein?
 W
 X
 Y
 Z

20. Starting in the esophagus, how many sphincters will an indigestible fibre molecule pass through on its way to the small intestine?
 One.
 Two.
 Three.
 Four.

21. One function of the liver is the production of
 urea.
 lipase.
 mucus.
 hydrochloric acid.

22. The removal of a large section of the colon is likely to affect the
 release of bile.
 digestion of fats.
 absorption of glucose.
 water balance in the body.

23. When salivary amylase enters the stomach, it becomes
 basic.
 acidic.
 buffered.
 denatured.

24. A function of the cardiac sphincter is to prevent movement of acid chyme from the
 esophagus to the mouth.
 stomach to the esophagus.
 duodenum to the stomach.
 colon to the small intestine.

25. Which of the following protects the stomach from hydrochloric acid?
 Bile.
 Pepsin.
 Mucus.
 Bicarbonate ions.

26. Which of the following could be found within the walls of the stomach, but NOT the chamber of the stomach?
 HCl.
 Pepsin.
 Gastrin.
 Trypsin.

27. Which of the following structures does NOT produce digestive enzymes?
 Stomach.
 Pancreas.
 Small intestine.
 Large intestine.

28. The presence of food in the trachea indicates a malfunctioning
 pharynx.
 epiglottis.
 esophagus.
 cardiac sphincter.

29. Which of the following pancreatic secretions doesn’t enter the duodenum?
 Lipase.
 Insulin.
 Trypsin.
 Bicarbonate ions.

30. Which enzymes are produced and secreted in an inactive form?
 Lipases.
 Proteases.
 Amylases.
 Nucleases.

31. Pancreatic juices are
 alkaline (basic).
 a good source of vitamins.
 necessary for the release of insulin.
 unnecessary for the digestion of fat.

32. A sampling of the material from one region of the digestive system was found to contain both maltase and peptidases. Which region was the sample taken from?
 Ileum.
 Stomach.
 Pancreas.
 Duodenum.

33. In which set of digestive organs does physical digestion occur?
 Mouth and stomach.
 Mouth and small intestine.
 Stomach and small intestine.
 Mouth, stomach and small intestine.

34. In how many of the structures listed below does peristalsis occur?

• Esophagus
• Stomach
• Small intestine
• Large intestine

 One.
 Two.
 Three.
 Four.

35. Which of the following is the correct sequence of terms used to identify the food material as is passes along the digestive tract?
 Bolus, acidic chyme, feces, chyme.
 Chyme, acidic chyme, feces, bolus.
 Bolus, chyme, acidic chyme, feces.
 Bolus, acidic chyme, chyme, feces.