NSG 5140 Gastrointestinal Pathophysiology Updated Exam
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What is the primary function of the lower esophageal sphincter (LES)?
Answer: The lower esophageal sphincter prevents gastric contents from
refluxing into the esophagus.
Rationale: The LES is a specialized ring of smooth muscle located at the
junction of the esophagus and stomach. It remains tonically contracted
to prevent the backflow of acidic gastric contents. Dysfunction or
relaxation of the LES is the primary mechanism underlying
gastroesophageal reflux disease (GERD), which can result in esophagitis,
Barrett esophagus, and esophageal adenocarcinoma.
Which condition is characterized by the replacement of normal
squamous epithelium of the esophagus with columnar epithelium?
Answer: Barrett esophagus.
,Rationale: Barrett esophagus develops as a complication of chronic
GERD. Continuous exposure to gastric acid causes metaplasia of the
esophageal lining, replacing squamous cells with specialized intestinal-
type columnar cells. This adaptation increases the risk of esophageal
adenocarcinoma.
What is the most common cause of peptic ulcer disease?
Answer: Helicobacter pylori infection.
Rationale: Helicobacter pylori damages the protective gastric mucosal
barrier, allowing acid and pepsin to injure underlying tissues. Although
NSAID use is another major cause, H. pylori remains the leading global
cause of peptic ulcer disease.
Which gastrointestinal hormone stimulates gastric acid secretion?
Answer: Gastrin.
Rationale: Gastrin is secreted by G cells in the gastric antrum and
stimulates parietal cells to produce hydrochloric acid. Gastrin also
promotes gastric motility and mucosal growth, making it essential for
normal digestion.
Which cells of the stomach secrete hydrochloric acid?
,Answer: Parietal cells.
Rationale: Parietal cells, located within the gastric glands of the fundus
and body, secrete hydrochloric acid and intrinsic factor. Hydrochloric
acid activates pepsinogen into pepsin, while intrinsic factor is necessary
for vitamin B12 absorption.
What vitamin deficiency commonly develops after destruction of
gastric parietal cells?
Answer: Vitamin B12 deficiency.
Rationale: Parietal cell destruction reduces intrinsic factor production.
Without intrinsic factor, vitamin B12 cannot be absorbed in the
terminal ileum, eventually leading to pernicious anemia and
neurological complications.
What is the primary pathological mechanism of gastroesophageal reflux
disease (GERD)?
Answer: Incompetence of the lower esophageal sphincter.
Rationale: Reduced LES pressure permits reflux of acidic gastric
contents into the esophagus, causing inflammation, mucosal injury,
, heartburn, and possible long-term complications including Barrett
esophagus.
Which type of esophageal cancer is most strongly associated with
Barrett esophagus?
Answer: Adenocarcinoma.
Rationale: Chronic intestinal metaplasia significantly increases the risk
for adenocarcinoma of the distal esophagus. Regular surveillance is
recommended in patients with Barrett esophagus.
Which bacteria are responsible for most cases of chronic gastritis
worldwide?
Answer: Helicobacter pylori.
Rationale: Persistent H. pylori infection causes chronic inflammation of
the gastric mucosa, increasing the risk of peptic ulcers, gastric
adenocarcinoma, and mucosa-associated lymphoid tissue (MALT)
lymphoma.
Which gastric cells produce intrinsic factor?
2026 WITH Recent Newest Verified And Well Analyzed Exam
Questions (Actual Exam 2026-2027) Correct Detailed &
Verified ANSWERS (100% Accurate Solutions) ALREADY
GRADED A+||NEWEST VERSION Of The Exam Guarantee
Pass!!|INSTANT PDF DOWNLOAD
What is the primary function of the lower esophageal sphincter (LES)?
Answer: The lower esophageal sphincter prevents gastric contents from
refluxing into the esophagus.
Rationale: The LES is a specialized ring of smooth muscle located at the
junction of the esophagus and stomach. It remains tonically contracted
to prevent the backflow of acidic gastric contents. Dysfunction or
relaxation of the LES is the primary mechanism underlying
gastroesophageal reflux disease (GERD), which can result in esophagitis,
Barrett esophagus, and esophageal adenocarcinoma.
Which condition is characterized by the replacement of normal
squamous epithelium of the esophagus with columnar epithelium?
Answer: Barrett esophagus.
,Rationale: Barrett esophagus develops as a complication of chronic
GERD. Continuous exposure to gastric acid causes metaplasia of the
esophageal lining, replacing squamous cells with specialized intestinal-
type columnar cells. This adaptation increases the risk of esophageal
adenocarcinoma.
What is the most common cause of peptic ulcer disease?
Answer: Helicobacter pylori infection.
Rationale: Helicobacter pylori damages the protective gastric mucosal
barrier, allowing acid and pepsin to injure underlying tissues. Although
NSAID use is another major cause, H. pylori remains the leading global
cause of peptic ulcer disease.
Which gastrointestinal hormone stimulates gastric acid secretion?
Answer: Gastrin.
Rationale: Gastrin is secreted by G cells in the gastric antrum and
stimulates parietal cells to produce hydrochloric acid. Gastrin also
promotes gastric motility and mucosal growth, making it essential for
normal digestion.
Which cells of the stomach secrete hydrochloric acid?
,Answer: Parietal cells.
Rationale: Parietal cells, located within the gastric glands of the fundus
and body, secrete hydrochloric acid and intrinsic factor. Hydrochloric
acid activates pepsinogen into pepsin, while intrinsic factor is necessary
for vitamin B12 absorption.
What vitamin deficiency commonly develops after destruction of
gastric parietal cells?
Answer: Vitamin B12 deficiency.
Rationale: Parietal cell destruction reduces intrinsic factor production.
Without intrinsic factor, vitamin B12 cannot be absorbed in the
terminal ileum, eventually leading to pernicious anemia and
neurological complications.
What is the primary pathological mechanism of gastroesophageal reflux
disease (GERD)?
Answer: Incompetence of the lower esophageal sphincter.
Rationale: Reduced LES pressure permits reflux of acidic gastric
contents into the esophagus, causing inflammation, mucosal injury,
, heartburn, and possible long-term complications including Barrett
esophagus.
Which type of esophageal cancer is most strongly associated with
Barrett esophagus?
Answer: Adenocarcinoma.
Rationale: Chronic intestinal metaplasia significantly increases the risk
for adenocarcinoma of the distal esophagus. Regular surveillance is
recommended in patients with Barrett esophagus.
Which bacteria are responsible for most cases of chronic gastritis
worldwide?
Answer: Helicobacter pylori.
Rationale: Persistent H. pylori infection causes chronic inflammation of
the gastric mucosa, increasing the risk of peptic ulcers, gastric
adenocarcinoma, and mucosa-associated lymphoid tissue (MALT)
lymphoma.
Which gastric cells produce intrinsic factor?
