Physiology Gastro-Intestinal Tract Set 2

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Physiology (Gastro-Intestinal Tract Set 2)

MCQ

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1. The ileocecal sphincter :

A) Prevents acid from entering the esophagus

B) prevents bacterial growth in the stomach

C) prevents bacterial infection of small intestine

D) inhibits gastric emptying

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2. Inhibition of vagal function has the greatest effect on which segment of the alimentary tract?

A) Anal sphincter

B) Descending colon

C) Stomach

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3. Which of the following is true about pancreatic secretions?

A) CCK causes release of bicarbonate

B) secretin causes release of enzymes

C) gastrin stimulates release of enzymes

D) CCK stimulates release of enzymes while secretin stimulates release of bicarbonate

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4. Chief cells of gastric mucosa secrete :

A) Trypsin

B) bicarbonate ions

C) pepsinogen

D) HCL

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5. The hormone that inhibit gastric secretion and motility is :

A) Gastrin

B) histamine

C) secretin

D) Pepsin

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6. Which of the following is a likely consequence of ileal resection?

A) Achalasia

B) Atrophic gastritis

C) Constipation

D) Peptic ulcer

E) Vitamin B12 deficiency

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7. the process by which large pieces of food are cut and crushed into smaller pieces is called :

A) emulsification

B) deglutition

C) mechanical digestion

D) absorption

E) peristalsis

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8. Digestion of proteins begins in the :

A) large intestine

B) small intestine

C) esophagus

D) mouth

E) stomach

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9. The enzyme that digests proteins is :

A) chyme

B) amylase

C) lipase

D) pepsin

E) bile

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10. The digestion of all types of nutrients is completed in the :

A) stomach

B) esophagus

C) small intestine

D) large intestine

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11. The enzyme in saliva helps to digest :

A) starch

B) proteins

C) fats

D) none of the

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12. The intrinsic nerve plexuses :

A) are located in the mucosal region

B) network of neurons that act as "gut" brain

C) are made up of two plexuses

D) B+C are true

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13. Intrinsic factor is :

A) secreted by parietal cells and is responsible for vitamin B12 absorption

B) not necessary for normal body function

C) abundant in pernicious anemia

D) an aminopeptidase

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14. Which of the following hormones is released by the presence of fat and protein in the small intestine
and has a major effect to decrease gastric emptying?

A) Cholecystokinin (CCK)

B) Glucose-dependent insulinotropic peptide (GLIP)

C) Gastrin

D) Motilin

E) Secretin

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15. Swallowing is a complex process that involves signaling between the pharynx and swallowing
center in the brainstem. Which of the following structures is critical for determining whether a bolus of
food is small enough to be swallowed?

A) Epiglottis

B) Larynx

C) Palatopharyngeal folds

D) Soft palate

E) Upper esophageal sphincter

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16. Saliva DOESN’T contain :

A) Blood group antigens

B) Lysosomes

C) Immunoglobulins

D) Platelets

E) Chloride

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17. The gastric juice produced in the stomach contains mucus, hydrochloric acid, and :

A) bile

B) lipase

C) pepsin

D) amylase

E) chyme

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18. Bile acts on :

A) distention in the stomach

B) acid in the stomach

C) fat in the stomach

D) fat in the duodenum

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19. Which of the following is true of the gastro enteric reflex?

A) It leads to increased peristaltic activity in the small intestine

B) It leads to defecation

C) It stimulates contractions of the colon

D) It leads to decreased peristaltic activity in the small intestine

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20. Food that leaves the stomach is in the form of a thick liquid. This liquid is called :

A) bile

B) villus

C) chyme

D) pepsin

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21. Lipids :

A) are broken down by pepsin

B) are absorbed into lacteals

C) become part of micelles in the duodenum

D) B+C are true

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22. The process of breaking down large droplets of fat into small droplets of fat is called :

A) emulsification

B) deglutition

C) mechanical digestion

D) absorption

E) peristalsis

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23. Stimulation of the submucosal plexus results in an increase in which of the following?

A) Stomach PH

B) Secretion of the gut

C) Motility of the gut

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24. Which of the following would most likely decrease the number of spike potentials
generated in the GI smooth muscle?

A) Sympathetic Stimulation

B) Acetylcholine

C) Stretching of the muscle

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25. Which of following digestive organs does not show peristalsis:

A) Esophagus

B) Stomach

C) Small intestine

D) Caecum

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Physiology Gastro-Intestinal Tract Set 2

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