, NR 507 Advanced Pathophysiology:
Week 8 High-Yield Questions, Answers,
& Rationales 2026/2027 Update
Question 1: Gastrointestinal Pathophysiology -
Inflammatory Bowel Disease (Crohn vs. Ulcerative Colitis)
What key histopathological and anatomical differences
distinguish Crohn Disease from Ulcerative Colitis?
A. Crohn disease is characterized by transmural
inflammation, skip lesions, noncaseating granulomas, and
cobblestone appearance anywhere along the GI tract;
ulcerative colitis is limited to the colon and rectum,
featuring continuous superficial mucosal inflammation,
crypt abscesses, and pseudopolyps.
B. Crohn disease is restricted exclusively to the rectal
mucosa with continuous crypt destruction, while ulcerative
colitis exhibits transmural skip lesions throughout the small
bowel.
C. Both conditions present with identical noncaseating
granulomas and mucosal sparing in the descending colon.
D. Ulcerative colitis is defined by transmural
granulomatous necrosis of the terminal ileum with fistulas.
Correct Answer: A. Crohn disease is characterized by
transmural inflammation, skip lesions, noncaseating
granulomas, and cobblestone appearance anywhere along
the GI tract; ulcerative colitis is limited to the colon and
rectum, featuring continuous superficial mucosal
inflammation, crypt abscesses, and pseudopolyps.
,Explanation: Inflammatory bowel diseases (IBD) exhibit
distinct pathological patterns. Crohn disease can affect any part
of the GI tract (most commonly the terminal ileum) with patchy
"skip lesions," transmural involvement leading to strictures,
fistulas, and creeping fat, and granulomas in about 30% of cases.
Ulcerative colitis is strictly confined to the colon and rectum,
spreading continuously from the rectum upwards, involving only
the mucosa and submucosa with crypt abscesses, ulcerations,
and a high risk of toxic megacolon and colorectal carcinoma.
Question 2: Gastrointestinal Pathophysiology - Peptic Ulcer
Disease
What primary etiological factors disrupt mucosal defense
mechanisms in Peptic Ulcer Disease?
A. Infection by Helicobacter pylori (which produces
urease, damages mucosal cells, and stimulates
inflammatory cytokine release) and chronic use of
Nonsteroidal Anti-inflammatory Drugs (NSAIDs, which
inhibit cyclooxygenase-1 and deplete protective gastric
mucosal prostaglandins).
B. Autoimmune destruction of duodenal Brunner glands
and hypersecretion of insulin.
C. Excessive physical exercise leading to splanchnic
vasoconstriction and mucosal ischemia of the esophagus.
D. Primary congenital overproduction of bicarbonate by
pancreatic acinar cells.
Correct Answer: A. Infection by Helicobacter pylori (which
produces urease, damages mucosal cells, and stimulates
inflammatory cytokine release) and chronic use of
, Nonsteroidal Anti-inflammatory Drugs (NSAIDs, which
inhibit cyclooxygenase-1 and deplete protective gastric
mucosal prostaglandins).
Explanation: Peptic ulcer disease arises from an imbalance
between aggressive mucosal factors (acid, pepsin, H. pylori,
NSAIDs) and defensive mechanisms (gastric mucosal barrier,
bicarbonate secretion, prostaglandins, blood flow). H. pylori
colonizes the gastric antrum, using urease to buffer gastric acid
while releasing cytotoxins that induce inflammation. NSAIDs
block COX-1, shutting down prostaglandin synthesis, which
compromises mucus and bicarbonate secretion and mucosal
blood flow.
Question 3: Endocrine Pathophysiology - Addison Disease
vs. Cushing Syndrome
What fundamental hormonal imbalances characterize Primary
Adrenal Insufficiency (Addison Disease)?
A. Autoimmune destruction of all zones of the adrenal
cortex leads to deficiency of cortisol, aldosterone, and
adrenal androgens; lack of negative feedback triggers
elevated ACTH and melanocyte-stimulating hormone
(MSH) levels, causing hyperpigmentation, hypotension,
hyponatremia, and hyperkalemia.
B. Autonomous hypersecretion of cortisol from an
adrenocortical adenoma with suppressed plasma ACTH
levels.
C. Anterior pituitary microadenoma hypersecreting
excessive ACTH and stimulating bilateral adrenal
hypertrophy.
Week 8 High-Yield Questions, Answers,
& Rationales 2026/2027 Update
Question 1: Gastrointestinal Pathophysiology -
Inflammatory Bowel Disease (Crohn vs. Ulcerative Colitis)
What key histopathological and anatomical differences
distinguish Crohn Disease from Ulcerative Colitis?
A. Crohn disease is characterized by transmural
inflammation, skip lesions, noncaseating granulomas, and
cobblestone appearance anywhere along the GI tract;
ulcerative colitis is limited to the colon and rectum,
featuring continuous superficial mucosal inflammation,
crypt abscesses, and pseudopolyps.
B. Crohn disease is restricted exclusively to the rectal
mucosa with continuous crypt destruction, while ulcerative
colitis exhibits transmural skip lesions throughout the small
bowel.
C. Both conditions present with identical noncaseating
granulomas and mucosal sparing in the descending colon.
D. Ulcerative colitis is defined by transmural
granulomatous necrosis of the terminal ileum with fistulas.
Correct Answer: A. Crohn disease is characterized by
transmural inflammation, skip lesions, noncaseating
granulomas, and cobblestone appearance anywhere along
the GI tract; ulcerative colitis is limited to the colon and
rectum, featuring continuous superficial mucosal
inflammation, crypt abscesses, and pseudopolyps.
,Explanation: Inflammatory bowel diseases (IBD) exhibit
distinct pathological patterns. Crohn disease can affect any part
of the GI tract (most commonly the terminal ileum) with patchy
"skip lesions," transmural involvement leading to strictures,
fistulas, and creeping fat, and granulomas in about 30% of cases.
Ulcerative colitis is strictly confined to the colon and rectum,
spreading continuously from the rectum upwards, involving only
the mucosa and submucosa with crypt abscesses, ulcerations,
and a high risk of toxic megacolon and colorectal carcinoma.
Question 2: Gastrointestinal Pathophysiology - Peptic Ulcer
Disease
What primary etiological factors disrupt mucosal defense
mechanisms in Peptic Ulcer Disease?
A. Infection by Helicobacter pylori (which produces
urease, damages mucosal cells, and stimulates
inflammatory cytokine release) and chronic use of
Nonsteroidal Anti-inflammatory Drugs (NSAIDs, which
inhibit cyclooxygenase-1 and deplete protective gastric
mucosal prostaglandins).
B. Autoimmune destruction of duodenal Brunner glands
and hypersecretion of insulin.
C. Excessive physical exercise leading to splanchnic
vasoconstriction and mucosal ischemia of the esophagus.
D. Primary congenital overproduction of bicarbonate by
pancreatic acinar cells.
Correct Answer: A. Infection by Helicobacter pylori (which
produces urease, damages mucosal cells, and stimulates
inflammatory cytokine release) and chronic use of
, Nonsteroidal Anti-inflammatory Drugs (NSAIDs, which
inhibit cyclooxygenase-1 and deplete protective gastric
mucosal prostaglandins).
Explanation: Peptic ulcer disease arises from an imbalance
between aggressive mucosal factors (acid, pepsin, H. pylori,
NSAIDs) and defensive mechanisms (gastric mucosal barrier,
bicarbonate secretion, prostaglandins, blood flow). H. pylori
colonizes the gastric antrum, using urease to buffer gastric acid
while releasing cytotoxins that induce inflammation. NSAIDs
block COX-1, shutting down prostaglandin synthesis, which
compromises mucus and bicarbonate secretion and mucosal
blood flow.
Question 3: Endocrine Pathophysiology - Addison Disease
vs. Cushing Syndrome
What fundamental hormonal imbalances characterize Primary
Adrenal Insufficiency (Addison Disease)?
A. Autoimmune destruction of all zones of the adrenal
cortex leads to deficiency of cortisol, aldosterone, and
adrenal androgens; lack of negative feedback triggers
elevated ACTH and melanocyte-stimulating hormone
(MSH) levels, causing hyperpigmentation, hypotension,
hyponatremia, and hyperkalemia.
B. Autonomous hypersecretion of cortisol from an
adrenocortical adenoma with suppressed plasma ACTH
levels.
C. Anterior pituitary microadenoma hypersecreting
excessive ACTH and stimulating bilateral adrenal
hypertrophy.
