BIOD331 Module 7 Gastrointestinal disorders
Comprehensive Final Test (Qns & Ans)
2025
Question 1 (Multiple Choice)
Question:
A 52‐year-old patient with a long history of gastroesophageal
reflux presents with dysphagia and weight loss. Endoscopy
reveals Barrett’s esophagus with low‐grade dysplasia. Which
pathophysiologic mechanism best explains the development of
Barrett’s esophagus?
A) High gastric acid secretion leading to esophageal ulceration
B) Chronic acid exposure causing metaplastic transformation of
squamous epithelium
C) Autoimmune-mediated destruction of the esophageal mucosa
D) Impaired esophageal peristalsis resulting in food stasis
©2025
, Correct ANS:
B) Chronic acid exposure causing metaplastic transformation of
squamous epithelium
Rationale:
Barrett’s esophagus arises from the repeated exposure of the
lower esophageal squamous epithelium to gastric acid, which
triggers a metaplastic change into columnar epithelium better
suited to resist acid injury. This process is the body’s adaptive
response against chronic acid reflux.
---
Question 2 (Fill in the Blank)
Question:
In patients with celiac disease, chronic ingestion of gluten leads to
an autoimmune response causing villous ______ in the small
intestine.
Correct ANS:
atrophy
Rationale:
©2025
,The immune-mediated reaction triggered by gluten in susceptible
individuals causes inflammation and subsequent flattening
(atrophy) of the intestinal villi. This villous atrophy results in
malabsorption and associated gastrointestinal symptoms.
---
Question 3 (True/False)
Question:
True/False: Peptic ulcer disease is most commonly caused by
Helicobacter pylori infection and nonsteroidal anti-inflammatory
drug (NSAID) use, both of which compromise the mucosal
defense against acid.
Correct ANS:
True
Rationale:
The two primary etiologic factors in peptic ulcer disease are H.
pylori infection and NSAID usage. H. pylori directly damages the
mucosal lining, and NSAIDs impair prostaglandin synthesis,
reducing mucosal protection and predisposing patients to ulcer
formation.
©2025
, ---
Question 4 (Multiple Response)
Question:
Select all factors that are considered contributing to the
pathogenesis of inflammatory bowel disease (IBD):
A) Genetic predisposition with certain HLA haplotypes
B) Dysbiosis of the gut microbiota
C) Environmental triggers such as smoking and diet
D) An abnormal immune response leading to chronic
inflammation
E) Excessive acid secretion in the stomach
Correct ANS:
A, B, C, D
Rationale:
IBD (including Crohn’s disease and ulcerative colitis) results
from a multifactorial interplay of genetic susceptibility (A),
alterations in the gut microbiome (B), environmental factors (C),
and dysregulated immune responses (D). Excess acid secretion
(E) is not a contributor to IBD pathogenesis.
©2025
Comprehensive Final Test (Qns & Ans)
2025
Question 1 (Multiple Choice)
Question:
A 52‐year-old patient with a long history of gastroesophageal
reflux presents with dysphagia and weight loss. Endoscopy
reveals Barrett’s esophagus with low‐grade dysplasia. Which
pathophysiologic mechanism best explains the development of
Barrett’s esophagus?
A) High gastric acid secretion leading to esophageal ulceration
B) Chronic acid exposure causing metaplastic transformation of
squamous epithelium
C) Autoimmune-mediated destruction of the esophageal mucosa
D) Impaired esophageal peristalsis resulting in food stasis
©2025
, Correct ANS:
B) Chronic acid exposure causing metaplastic transformation of
squamous epithelium
Rationale:
Barrett’s esophagus arises from the repeated exposure of the
lower esophageal squamous epithelium to gastric acid, which
triggers a metaplastic change into columnar epithelium better
suited to resist acid injury. This process is the body’s adaptive
response against chronic acid reflux.
---
Question 2 (Fill in the Blank)
Question:
In patients with celiac disease, chronic ingestion of gluten leads to
an autoimmune response causing villous ______ in the small
intestine.
Correct ANS:
atrophy
Rationale:
©2025
,The immune-mediated reaction triggered by gluten in susceptible
individuals causes inflammation and subsequent flattening
(atrophy) of the intestinal villi. This villous atrophy results in
malabsorption and associated gastrointestinal symptoms.
---
Question 3 (True/False)
Question:
True/False: Peptic ulcer disease is most commonly caused by
Helicobacter pylori infection and nonsteroidal anti-inflammatory
drug (NSAID) use, both of which compromise the mucosal
defense against acid.
Correct ANS:
True
Rationale:
The two primary etiologic factors in peptic ulcer disease are H.
pylori infection and NSAID usage. H. pylori directly damages the
mucosal lining, and NSAIDs impair prostaglandin synthesis,
reducing mucosal protection and predisposing patients to ulcer
formation.
©2025
, ---
Question 4 (Multiple Response)
Question:
Select all factors that are considered contributing to the
pathogenesis of inflammatory bowel disease (IBD):
A) Genetic predisposition with certain HLA haplotypes
B) Dysbiosis of the gut microbiota
C) Environmental triggers such as smoking and diet
D) An abnormal immune response leading to chronic
inflammation
E) Excessive acid secretion in the stomach
Correct ANS:
A, B, C, D
Rationale:
IBD (including Crohn’s disease and ulcerative colitis) results
from a multifactorial interplay of genetic susceptibility (A),
alterations in the gut microbiome (B), environmental factors (C),
and dysregulated immune responses (D). Excess acid secretion
(E) is not a contributor to IBD pathogenesis.
©2025
