The Digestive System

46 Questions  I  By Dru31988
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Digestive System Quizzes & Trivia
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  • 1. 
    ____________ is the physiological process that moves a nutrient from the outside to the inside of the body. 
    • A. 

      Ingestion

    • B. 

      Compaction

    • C. 

      Digestion

    • D. 

      Absorption

    • E. 

      Secretion


  • 2. 
     The serous membranes that suspend the stomach and intestines from the abdominal wall are called 
    • A. 

      Mesenteries

    • B. 

      Mucosae

    • C. 

      Submucosae

    • D. 

      Muscularis mucosae

    • E. 

      Muscularis externa


  • 3. 
    These nutrients are all absorbed without being digested except 
    • A. 

      Water

    • B. 

      Vitamins

    • C. 

      Proteins

    • D. 

      Minerals

    • E. 

      Cholesterol


  • 4. 
    These are all accessory organ of the digestive system except 
    • A. 

      Toungue

    • B. 

      Liver

    • C. 

      Pancreas

    • D. 

      Salivary glands

    • E. 

      Spleen


  • 5. 
    Each of the following lists some of the tissue layers of the digestive tract. Which one has them in correct order from lumen to external surface? 
    • A. 

      Lamina propria, muscularis mucosae, submucosa, muscularis externa, serosa

    • B. 

      Serosa, lamina propria, submucosa, muscularis mucosae, muscularis externa

    • C. 

      Mucosa, submucosa, muscularis mucosae, muscularis externa, lamina propria

    • D. 

      Mucosa, muscularis mucosae, submucosa, muscularis externa, lamina propria

    • E. 

      Mucosa, submucosa, muscularis externa, lamina propria, serosa


  • 6. 
     The small intestine is suspended from the abdominal wall by 
    • A. 

      The falciform ligament

    • B. 

      The mesentery

    • C. 

      The greater omentum

    • D. 

      The lesser omentum

    • E. 

      The esophageal hiatus


  • 7. 
    Chemical digestion breaks down _____________ into __________________.
    • A. 

      Proteins; meucleotides

    • B. 

      Amino acids; proteins

    • C. 

      Polysaccharides; nucleotides

    • D. 

      Nucleic acids; nucleotides

    • E. 

      Fatty acids; cholestrol


  • 8. 
    The ___________ regulates digestive tract motility, secretion, and blood flow and its neurons are found in the ____________. 
    • A. 

      Autonomic nervous system; serosa

    • B. 

      Central nervous system; muscularis externa and muscularis mucosae

    • C. 

      Enteric nervous system; submucosa and muscularis externa

    • D. 

      Visceral sensory division; muscularis externa and submucosa

    • E. 

      Visceral motor division; mucosa and submucosa


  • 9. 
    The surface of the tongue is covered with ____________ stratified squamous epithelium, and has bumps called __________________, site of taste buds. 
    • A. 

      Keratinized; lingual papillae

    • B. 

      Keratinized; lingual frenulum

    • C. 

      Nonkeratinized; lingual papillae

    • D. 

      Nonkeratinized; tonsils

    • E. 

      Nonkeratinized; vallate papillae


  • 10. 
    Infants have ________________ deciduous teeth, whereas adults have ________________ permanent teeth. 
    • A. 

      20; 32

    • B. 

      16; 20

    • C. 

      28;20

    • D. 

      32;20

    • E. 

      32;32


  • 11. 
    From superficial to deep, these are the structures found in a typical tooth. 
    • A. 

      Cementum, root canal, enamel

    • B. 

      Enamel, root canal, dentin

    • C. 

      Dentin, enamel, cementum

    • D. 

      Enamel, dentin, pulp

    • E. 

      Crown, enamel, dentin


  • 12. 
    These are normally found in saliva except 
    • A. 

      Mucus

    • B. 

      Lysozyme

    • C. 

      Anylase

    • D. 

      Lipase

    • E. 

      Protease


  • 13. 
    The ______________ gland is an extrinsic salivary gland; whereas the ______________ gland is an intrinsic salivary gland. 
    • A. 

      Lingual; labial

    • B. 

      Submandibular; lingual

    • C. 

      Submandibular; sublingual

    • D. 

      Sublingual; parotid

    • E. 

      Lingual; sublingual


  • 14. 
    The swallowing center is located in
    • A. 

      The mouth

    • B. 

      The oropharynx

    • C. 

      The esopharynx

    • D. 

      The medulla oblongata

    • E. 

      The enteric nervous system


  • 15. 
    . The buccal phase of swallowing is under _____________ control and the pharyngo-esophageal phase is ______________. 
    • A. 

      Central nervous system; also controlled by the central nervous system

    • B. 

      Central nervous system; controlled by autonomic reflexes

    • C. 

      Autonomic nervous system; controlled by autonomic reflexes

    • D. 

      Voluntary; also voluntary

    • E. 

      Involuntary; also involuntary


  • 16. 
    Acid reflux into the esophagus ("heartburn") is normally prevented by 
    • A. 

      Pharyngeal constrictors.

    • B. 

      The upper esophageal sphincter.

    • C. 

      The lower esophageal sphincter (LES).

    • D. 

      Esophageal glands.

    • E. 

      Pharyngeal and buccal sphincters.


  • 17. 
    Hydrochloric acid (HCl) is secreted by ____________ cells. 
    • A. 

      Mucous

    • B. 

      Regenerative (stem)

    • C. 

      Parietal

    • D. 

      Chief

    • E. 

      Enteroendocrine


  • 18. 
    ____________, which is secreted by ___________ cells, is necessary for Vitamin B12 absorption. 
    • A. 

      Intrinsic factor; parietal

    • B. 

      Bile salts; chief

    • C. 

      Lecithin; hepatic

    • D. 

      Hydrochloric acid; parietal

    • E. 

      Enterokinase; mucous


  • 19. 
    Pepsinogen is produced by ____________ and is activated by ___________. 
    • A. 

      Chief cells; carbonic anhydrase (CAH) secreted by parietal cells

    • B. 

      Chief cells; hydrochloric acid (HCl) secreted by parietal cells

    • C. 

      Parietal cells; hydrochloric acid (HCl) secreted by chief cells

    • D. 

      Parietal cells; carbonic anhydrase (CAH) secreted by chief cells

    • E. 

      Enteroendocrine cells; carbonic anhydrase (CAH) secreted by parietal cells


  • 20. 
    Why are several digestive enzymes secreted as zymogens? 
    • A. 

      Because this saves one step in their synthesis

    • B. 

      Because gastric cells do not have the necessary enzymes for their synthesis

    • C. 

      So they start digesting intracellular proteins of the gastric cells more quickly

    • D. 

      So they act only in the stomach lumen and do not digest intracellular proteins

    • E. 

      So they can start digesting dietary proteins more quickly


  • 21. 
    The enterogastric reflex serves to 
    • A. 

      Relax the stomach in preparation for swallowed food.

    • B. 

      Stimulate acid and enzyme secretion when food enters the stomach.

    • C. 

      Stimulate intestinal motility when there is food in the stomach.

    • D. 

      Inhibit gastric motility when there is chyme in the small intestine.

    • E. 

      Relax the ileocecal valve when chyme is on its way to the colon.


  • 22. 
    . ______________ is a hormone, whereas ________________ is an enzyme. 
    • A. 

      Enterokinase; pepsin

    • B. 

      Gastrin; secretin

    • C. 

      Gastrin; cholecystokinin (CCK)

    • D. 

      Gastric lipase; histamine

    • E. 

      Secretin; pepsin


  • 23. 
    _____________ is associated with food stretching the stomach and activating myenteric and vagovagal reflexes, which in turn stimulate gastric secretions. 
    • A. 

      The cephalic phase

    • B. 

      The gastric phase

    • C. 

      The intestinal phase

    • D. 

      The gastrointestinal phase

    • E. 

      The mesenteric phase


  • 24. 
    The organ that stores excess glucose and releases it later into the blood is 
    • A. 

      The pancreas.

    • B. 

      The stomach

    • C. 

      The liver

    • D. 

      The spleen

    • E. 

      The small intestine


  • 25. 
    A hepatic triad consists of 
    • A. 

      Right, left, and common hepatic ducts.

    • B. 

      Common hepatic duct, cystic duct, and bile duct.

    • C. 

      The hepatic portal vein and two hepatic ducts.

    • D. 

      Bile ductule, branch of hepatic artery, and branch of hepatic portal vein.

    • E. 

      A central vein, hepatic lobule, and hepatic sinusoid.


  • 26. 
    Of the following components of bile, only _____________ has/have a digestive function. 
    • A. 

      Bile salts

    • B. 

      Bilirubin

    • C. 

      Cholesterol

    • D. 

      Phpspholipids

    • E. 

      Neutral fats


  • 27. 
    The _______________ synthesizes bile acids by metabolizing ____________________. 
    • A. 

      Duodenum; neutral fats

    • B. 

      Ileum; bilirubin

    • C. 

      Gallbladder; cholesterol

    • D. 

      Pancreas; bile salts

    • E. 

      Liver; cholesterol


  • 28. 
    Pancreatic enzymes are secreted in response to the hormone 
    • A. 

      Insulin

    • B. 

      CCK

    • C. 

      Secretin

    • D. 

      Glucagon

    • E. 

      Gastrin


  • 29. 
    Which of these is not a component of the pancreatic juice? 
    • A. 

      Trypsinogen

    • B. 

      Chymotrypsinogen

    • C. 

      Deoxyribonuclease

    • D. 

      Sodium bicarbonate

    • E. 

      Enterokinase


  • 30. 
    Which of these nutrients is absorbed by the lacteals of the small intestine? 
    • A. 

      Triglycerides

    • B. 

      Amino acids

    • C. 

      Glucose

    • D. 

      Minerals

    • E. 

      Water-soluble vitamins


  • 31. 
    Which of the following enzymes functions at the lowest pH?  
    • A. 

      Salivary amylase

    • B. 

      Pancreatc amylase

    • C. 

      Pepsin

    • D. 

      Trypsin

    • E. 

      Dipeptodase


  • 32. 
    Which of these is the site of contact digestion? 
    • A. 

      Gastric pits

    • B. 

      Surface of the gastric mucosa

    • C. 

      Intestinal crypts

    • D. 

      Brush border of the small intestine

    • E. 

      Cytoplasm in the cells of the small intestine


  • 33. 
    The small intestine has a very large absorptive surface associated with all these structures except 
    • A. 

      Circular flods (plicae circulares)

    • B. 

      Intestinal length

    • C. 

      Microvilli

    • D. 

      Villi

    • E. 

      Rugae


  • 34. 
    The migrating motor complex 
    • A. 

      Milks the chyme toward the colon

    • B. 

      Allows a bolus to move down the esophagus.

    • C. 

      Churns and mixes residue in the descending colon

    • D. 

      Churns and mixes a bolus with gastric juices.

    • E. 

      Propels pancreatic juice down the pancreatic duct.


  • 35. 
    The ______________ of the small intestine is/are similar to the _________________ of the stomach. 
    • A. 

      Villi; pyloric glands

    • B. 

      Rugae; Peyer patches

    • C. 

      Intestinal crypts; gastric pits

    • D. 

      Goblet cells; parietal cells

    • E. 

      Pyloric sphincter; ileocecal valve


  • 36. 
    Carbohydrate digestion begins in the ______________, whereas protein digestion begins in the ______________. 
    • A. 

      Liver; small intestine

    • B. 

      Small intestine; stomach

    • C. 

      Mouth; stomach

    • D. 

      Mouth; small intestine

    • E. 

      Stomach; small intestine


  • 37. 
    The sodium-glucose trasnsport protein (SGLP)
    • A. 

      Is a uniport carrier

    • B. 

      Is an antiport carrier

    • C. 

      Uses solvent drag to transport glucose and sodium.

    • D. 

      Transports glucose and sodium from the intestinal lumen into the epithelial cells.

    • E. 

      Transports glucose from the intestinal lumen into the epithelial cells, and sodium in the opposite direction.


  • 38. 
    Amino acids and monosaccharides are absorbed in the ____________, and fatty acids are absorbed in the _______________. 
    • A. 

      Small intestine; large intestine

    • B. 

      Small intestine; liver

    • C. 

      Stomach; small intestine

    • D. 

      Stomach; large intestine

    • E. 

      Small intestine; small intestine too


  • 39. 
    Lecithin prepares fats for hydrolysis by forming 
    • A. 

      Triglycerides, fatty acids, and glycerol

    • B. 

      Low density lipoproteins (LDL).

    • C. 

      Chylomicrons.

    • D. 

      Emulsification droplets.

    • E. 

      Micelles.


  • 40. 
    Proteins are digested by different enzymes acting in the following sequence 
    • A. 

      Pepsin, trypsin, carboxypeptidase, dipeptidase.

    • B. 

      Pepsin, trypsin, dipeptidase, carboxypeptidase.

    • C. 

      Trypsin, pepsin, carboxypeptidase, dipeptidase.

    • D. 

      Trypsin, pepsin, dipeptidase, carboxypeptidase.

    • E. 

      Dipeptidase, carboxypeptidase, pepsin, trypsin


  • 41. 
    ____________ transport lipids to the surface of the intestinal absorptive cells, which process them into _________________. 
    • A. 

      Fat droplets; micelles

    • B. 

      Fat droplets; chylomicrons

    • C. 

      Micelles; fat globules

    • D. 

      Micelles; chylomicrons

    • E. 

      Fat globules; micelles


  • 42. 
    The three most abundant classes of nutrients are 
    • A. 

      Carbohydrates, proteins, and minerals.

    • B. 

      Fats, proteins, and carbohydrates.

    • C. 

      Proteins, nucleic acids, and carbohydrates.

    • D. 

      Triglycerides, starches, and proteins.

    • E. 

      Proteins, fats, and minerals.


  • 43. 
    The muscle tone of the ________________ along the colon contracts it lengthwise, causing its walls to bulge and form pouches called _______________. 
    • A. 

      Circular folds; ceca

    • B. 

      Taeniae coli; haustra

    • C. 

      Haustra; taeniae coli

    • D. 

      Internal sphincters; omental (epiploic) appendages

    • E. 

      Internal sphincters; ceca


  • 44. 
    Bacterial flora carry out all of the following except 
    • A. 

      Digest most of the proteins we get in the diet.

    • B. 

      Synthesize vitamin K.

    • C. 

      Produce some of the gases found in flatus

    • D. 

      Digest cellulose.

    • E. 

      Form part of the feces.


  • 45. 
    Bacteria constitute about __________% of the dry weight of the feces
    • A. 

      2

    • B. 

      14

    • C. 

      30

    • D. 

      55

    • E. 

      80


  • 46. 
     Defecation is stimulated by 
    • A. 

      The chemical composition of the feces.

    • B. 

      Bacterial flora in the feces.

    • C. 

      Water content of the feces.

    • D. 

      Lipid content in the feces.

    • E. 

      Stretching of the rectum


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