Chapter 24 Homework: The Digestive System

22. Enzymes in pancreatic juice include: - pancreatic amylase which digests starch - the enzymes which digest protein: trypsin, chymotrypsin, - carboxypeptidase and elastase - pancreatic lipase which digests fats and oil - all of these

All of these

13. Which of the following statements is INCORRECT? - Incisors are adapted for cutting into food. - Cuspids are used to tear and shred food. - Molars crush and grind food preparing it for swallowing - All of these statements are correct.

All of these statements are correct

27. The final stage of digestion occurs in the colon by the action of: - enzymes - smooth muscle - bacteria - micelles

Bacteria

10. The parotid glands are found - in the tongue. - between the skin and the masseter muscle. - in the floor of the mouth. - beneath the tongue. - in the palate.

Between the skin and the masseter muscle.

12. Optimum pH for sucrase activity is:

6.0

9. Which of the following statements about gastrointestinal reflex pathways is correct? - They regulate GI secretion and motility in response to stimuli present in the lumen of the GI tract. - They involve sensory receptors and chemoreceptors whose axons synapse with neurons in the ENS, CNS, or ANS. - They involve neurons of the ENS, CNS or ANS and activate or inhibit GI glands and smooth muscle, altering GI secretion and motility. - All of these statements are correct.

All of these statements are correct

28. Which of the following statements is INCORRECT regarding the enterogastric reflex? - Distention of the duodenum by chyme triggers it. - Stretch receptors in the duodenal wall are involved. - Sympathetic nerves inhibit gastric motility. - Contraction of the pyloric sphincter increases gastric emptying.

Contraction of the pyloric sphincter increases gastric emptying.

16. The pharynx is part of both the ___ and the ___ organ systems. - digestive and muscular - digestive and respiratory - respiratory and muscular - digestive and endocrine - digestive and skeletal

Digestive and Respiratory

8. Blood insulin/glucagon ratio is lowest - fasting - 1 hour post meal - 2 hours post meal - 3 hours post meal

Fasting

19. Which of the following statements is INCORRECT? - Rugae are large folds of the stomach mucosa. - Surface mucous cells and mucous neck cells secrete mucous which is protective in function. - Chief cells secrete pepsinogen and gastric lipase. - Parietal cells secrete intrinsic factor and hydrochloric acid. - G cells secrete cholecystokinin into the blood stream.

G cells secrete cholecystokinin into the blood stream.

2. All of the following are considered organs of the gastrointestinal tract EXCEPT the - pharynx. - small intestine. - gallbladder. - stomach. - esophagus.

Gallbladder

23. The highly permeable blood capillaries of the liver are called - hepatic laminae. - bile canaliculi. - hepatic sinusoids. - portal triads. - hepatic acini.

Hepatic sinusoids

21. The pancreatic duct unites with the common bile duct and enters the duodenum at the _______. - accessory duct - insula of reil - haustra - hepatopancreatic ampulla - santorini ampulla

Hepatopancreatic ampulla

24. Functions of the liver include all of the following EXCEPT: - bile secretion - synthesis of bile salts - detoxification - bilirubin excretion - insulin secretion

Insulin secretion

25. Lipids are typically transported from the intestine into the bloodstream via - capillaries. - cell-to-cell transport. - lacteals. - all of these.

Lacteals

15. Which is NOT a major salivary gland? - lingual glands - parotid glands - submandibular glands - sublingual glands - all of these choices are major salivary glands

Lingual glands

4. Where in the GI tract is skeletal (voluntary) muscle found? - mouth, pharynx, superior and middle part of esophagus, external sphincter - large and small intestine and stomach - mouth and large intestine - esophagus and small intestine

Mouth, pharynx, superior and middle part of esophagus, external sphincter

20. Hydrochloric acid and intrinsic factor are secreted in the stomach by - parietal cells. - chief cells. - G cells. - mucous neck cells. - surface mucous cells.

Parietal cells

1. Pancreatic juice contains all of the following except - chymotrypsin. - carboxypeptidase. - pepsin. - trypsin.

Pepsin

7. The cause of heartburn is ___. - heart murmurs - enlarged heart - reflux of gastric juice into the esophagus - erosion of the stomach lining

Reflux of gastric juice into the esophagus

6. Which of the following digestive system structures is INCORRECTLY matched? - mouth - gastrointestinal tract organ - teeth - accessory organ - gallbladder - accessory organ - esophagus - gastrointestinal tract organ - salivary glands - gastrointestinal tract organ

Salivary glands - gastrointestinal tract organ

29. Cholecystokinin and secretin both: - secrete pancreatic juice - decrease gastric juice production - are secreted by CCK cells of the stomach - inhibit gastric emptying

Secrete pancreatic juice

14. Which of the following statements about salivary glands is incorrect? - The parotid glands are located inferior and anterior to the ears between the skin and masseter muscle. - The submandibular glands are located in the floor of the mouth. - The sublingual glands are located beneath the tongue and inferior to the submandibular glands. - All of these statements are correct.

The sublingual glands are located beneath the tongue and inferior to the submandibular glands.

17. Which of the following statements is INCORRECT? - The esophagus produces digestive enzymes. - The esophageal mucosa consists of nonkeratinized stratified squamous epithelium. - At each end of the esophagus, the muscularis forms two sphincters the upper esophageal sphincter and the lower esophageal sphincter. - The upper esophageal sphincter consists of skeletal muscle and the lower of smooth muscle. - The esophagus secretes mucus and transports food to the stomach.

The esophagus produces digestive enzymes.

5. Which of the following statements is incorrect? - The mucosa is a serous membrane involved in protection and absorption. - The submucosa contains lymphatic vessels and blood vessels involved in absorption. - The muscularis breaks down food and propels it along the digestive tract.

The mucosa is a serous membrane involved in protection and absorption.

11. As sucrose concentration increases, sucrase activity eventually plateaus. Why does this occur? - There are more sucrose molecules than sucrase - Increasing sucrose inactivates sucrase - Sucrase activity decreases as product is formed - Sucrase can only catalyze one reaction

There are more sucrose molecules than sucrase

26. Bile salts convert fats into - large globules. - tiny droplets. - soluble molecules. - none of these.

Tiny droplets

30. This system requires water absorbed by the digestive tract to excrete waste products in urine. - lymphatic - endocrine - urinary - integumentary

Urinary

3. Which of the following do not undergo chemical digestion? - large carbohydrate, vitamins, proteins - nucleic acids, ions, cholesterol - carbohydrates, protein nucleic acids - vitamins, ions, cholesterol

Vitamins, ions, cholesterol

18. Moving a bolus to the back of the mouth by movement of the tongue backward and against the palate constitutes which phase of swallowing? - voluntary - involuntary - cephalic - peristaltic

Voluntary