KNH 184 FINAL EXAM Actual Exam Complete
Questions and Answers Detailed Rationales Pass
Guaranteed - A+ Graded
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SECTION 1: FOUNDATIONS OF NUTRITION & DIGESTION Q1 – Q10
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Question 1 of 50
A 28-year-old woman recently diagnosed with celiac disease meets with a registered
dietitian to understand why she experiences malabsorption. The dietitian explains that
her immune reaction to gluten damages a specific intestinal structure, impairing
nutrient uptake.
A. The microvilli lining the small intestine become flattened, reducing surface area for
absorption. ✓ CORRECT
B. The pyloric sphincter becomes inflamed, preventing chyme from entering the small
intestine.
C. The gallbladder stops producing bile, which is necessary for carbohydrate digestion.
D. The pancreas secretes excess lipase, which destroys the intestinal mucosal barrier.
Correct Answer: A
Rationale: In celiac disease, gluten triggers an autoimmune response that flattens the
villi and microvilli in the small intestine, drastically reducing the surface area available
for nutrient absorption. Option B is incorrect because the pyloric sphincter is not the
primary site of damage in celiac disease, and chyme still enters the duodenum. Patients
with celiac often present with iron-deficiency anemia and steatorrhea precisely because
of this malabsorption.
Question 2 of 50
,A 62-year-old man taking proton pump inhibitors daily for GERD reports new-onset
vitamin B12 deficiency and frequent gastrointestinal infections. His physician suspects
the medication is altering the normal digestive environment.
A. PPIs increase gastrin secretion, which destroys intrinsic factor needed for B12
absorption.
B. PPIs suppress gastric acid production, which is required to liberate B12 from food
proteins and to kill ingested pathogens. ✓ CORRECT
C. PPIs block pancreatic enzyme release, preventing the breakdown of complex
carbohydrates in the duodenum.
D. PPIs accelerate gastric emptying, reducing contact time between food and digestive
enzymes.
Correct Answer: B
Rationale: Gastric acid is essential for releasing vitamin B12 from dietary proteins and
for providing a bactericidal barrier against ingested microorganisms; long-term PPI use
raises both deficiency and infection risks. Option A is tempting because gastrin does
rise with PPI use, but the hormone itself does not destroy intrinsic factor. Clinicians
routinely monitor B12 status in patients on long-term acid suppression.
Question 3 of 50
A 45-year-old office worker increases his dietary fiber intake from 10 g to 35 g per day
after a prediabetes diagnosis. After two weeks, he reports bloating, flatulence, and
loose stools. He is drinking adequate water and has no known GI disease.
A. He is experiencing osmotic diarrhea caused by excessive insoluble fiber pulling water
into the colon.
B. The rapid fiber increase has caused a small bowel obstruction requiring immediate
medical evaluation.
C. Gut microbiota are fermenting the increased soluble fiber load, producing gas and
short-chain fatty acids that initially cause GI distress. ✓ CORRECT
D. Fiber is blocking pancreatic lipase secretion, preventing fat absorption and causing
steatorrhea.
,Correct Answer: C
Rationale: A sudden increase in soluble fiber provides substrate for rapid bacterial
fermentation in the colon, generating gas and temporarily altering stool consistency
until the microbiota adapt. Option A misattributes the symptoms to osmotic diarrhea
from insoluble fiber, but insoluble fiber typically adds bulk rather than causing loose
stools. Dietitians generally recommend increasing fiber gradually over several weeks to
minimize these adaptive symptoms.
Question 4 of 50
A premature infant in the NICU is receiving nutrition via a feeding tube placed in the
duodenum. The neonatologist is concerned about the infant's ability to absorb
long-chain fatty acids and fat-soluble vitamins.
A. The infant will absorb fats directly into the portal bloodstream because the feeding
tube bypasses the need for chylomicron formation.
B. Duodenal placement prevents bile from reaching the feedings, so fats cannot be
emulsified.
C. The infant can absorb all fats and fat-soluble vitamins equally well through passive
diffusion in the jejunum.
D. Long-chain fatty acids and fat-soluble vitamins require bile emulsification and micelle
formation before entering intestinal cells and packaging into chylomicrons. ✓
CORRECT
Correct Answer: D
Rationale: Long-chain fatty acids and fat-soluble vitamins depend on bile-mediated
emulsification and micelle formation for absorption, after which they are re-esterified
and packaged into chylomicrons for lymphatic transport. Option A incorrectly suggests
fats enter the portal blood directly; short- and medium-chain fats do, but long-chain fats
enter via the lymphatic system. Preterm infants often have limited bile salt pools, which
complicates lipid absorption.
, Question 5 of 50
A 30-year-old woman participating in a weight-loss study reports intense hunger
cravings late at night despite eating a balanced dinner. Researchers measure her serum
ghrelin and leptin levels.
A. Elevated ghrelin stimulates appetite by acting on the hypothalamus, while leptin
normally signals satiety when energy stores are adequate. ✓ CORRECT
B. High leptin levels indicate her brain is receiving strong satiety signals, so the cravings
are purely behavioral.
C. Ghrelin is secreted by adipose tissue and suppresses hunger when stomach volume
is high.
D. Leptin is produced in the stomach and peaks before meals to trigger meal initiation.
Correct Answer: A
Rationale: Ghrelin, produced primarily in the stomach, rises before meals and stimulates
hunger by activating NPY/AgRP neurons in the hypothalamus, whereas leptin from
adipose tissue signals energy sufficiency. Option B is incorrect because high leptin
would suppress hunger, not explain persistent cravings. Nighttime eating patterns are
often linked to circadian-driven ghrelin peaks that override leptin signaling.
Question 6 of 50
A 55-year-old man with alcoholic cirrhosis presents with low albumin, edema, and easy
bruising. His dietitian notes that his liver's metabolic capacity is severely compromised.
A. The liver has stopped producing glucagon, causing hypoglycemia and impaired
glycogenolysis.
B. The liver synthesizes albumin and clotting factors; cirrhosis impairs protein synthesis
and blood clotting capability. ✓ CORRECT
C. The damaged liver cannot absorb dietary amino acids from the hepatic portal vein.
D. Cirrhosis causes the gallbladder to overproduce bile, leading to fat malabsorption and
bleeding disorders.
Questions and Answers Detailed Rationales Pass
Guaranteed - A+ Graded
══════════════════════════════════════
SECTION 1: FOUNDATIONS OF NUTRITION & DIGESTION Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A 28-year-old woman recently diagnosed with celiac disease meets with a registered
dietitian to understand why she experiences malabsorption. The dietitian explains that
her immune reaction to gluten damages a specific intestinal structure, impairing
nutrient uptake.
A. The microvilli lining the small intestine become flattened, reducing surface area for
absorption. ✓ CORRECT
B. The pyloric sphincter becomes inflamed, preventing chyme from entering the small
intestine.
C. The gallbladder stops producing bile, which is necessary for carbohydrate digestion.
D. The pancreas secretes excess lipase, which destroys the intestinal mucosal barrier.
Correct Answer: A
Rationale: In celiac disease, gluten triggers an autoimmune response that flattens the
villi and microvilli in the small intestine, drastically reducing the surface area available
for nutrient absorption. Option B is incorrect because the pyloric sphincter is not the
primary site of damage in celiac disease, and chyme still enters the duodenum. Patients
with celiac often present with iron-deficiency anemia and steatorrhea precisely because
of this malabsorption.
Question 2 of 50
,A 62-year-old man taking proton pump inhibitors daily for GERD reports new-onset
vitamin B12 deficiency and frequent gastrointestinal infections. His physician suspects
the medication is altering the normal digestive environment.
A. PPIs increase gastrin secretion, which destroys intrinsic factor needed for B12
absorption.
B. PPIs suppress gastric acid production, which is required to liberate B12 from food
proteins and to kill ingested pathogens. ✓ CORRECT
C. PPIs block pancreatic enzyme release, preventing the breakdown of complex
carbohydrates in the duodenum.
D. PPIs accelerate gastric emptying, reducing contact time between food and digestive
enzymes.
Correct Answer: B
Rationale: Gastric acid is essential for releasing vitamin B12 from dietary proteins and
for providing a bactericidal barrier against ingested microorganisms; long-term PPI use
raises both deficiency and infection risks. Option A is tempting because gastrin does
rise with PPI use, but the hormone itself does not destroy intrinsic factor. Clinicians
routinely monitor B12 status in patients on long-term acid suppression.
Question 3 of 50
A 45-year-old office worker increases his dietary fiber intake from 10 g to 35 g per day
after a prediabetes diagnosis. After two weeks, he reports bloating, flatulence, and
loose stools. He is drinking adequate water and has no known GI disease.
A. He is experiencing osmotic diarrhea caused by excessive insoluble fiber pulling water
into the colon.
B. The rapid fiber increase has caused a small bowel obstruction requiring immediate
medical evaluation.
C. Gut microbiota are fermenting the increased soluble fiber load, producing gas and
short-chain fatty acids that initially cause GI distress. ✓ CORRECT
D. Fiber is blocking pancreatic lipase secretion, preventing fat absorption and causing
steatorrhea.
,Correct Answer: C
Rationale: A sudden increase in soluble fiber provides substrate for rapid bacterial
fermentation in the colon, generating gas and temporarily altering stool consistency
until the microbiota adapt. Option A misattributes the symptoms to osmotic diarrhea
from insoluble fiber, but insoluble fiber typically adds bulk rather than causing loose
stools. Dietitians generally recommend increasing fiber gradually over several weeks to
minimize these adaptive symptoms.
Question 4 of 50
A premature infant in the NICU is receiving nutrition via a feeding tube placed in the
duodenum. The neonatologist is concerned about the infant's ability to absorb
long-chain fatty acids and fat-soluble vitamins.
A. The infant will absorb fats directly into the portal bloodstream because the feeding
tube bypasses the need for chylomicron formation.
B. Duodenal placement prevents bile from reaching the feedings, so fats cannot be
emulsified.
C. The infant can absorb all fats and fat-soluble vitamins equally well through passive
diffusion in the jejunum.
D. Long-chain fatty acids and fat-soluble vitamins require bile emulsification and micelle
formation before entering intestinal cells and packaging into chylomicrons. ✓
CORRECT
Correct Answer: D
Rationale: Long-chain fatty acids and fat-soluble vitamins depend on bile-mediated
emulsification and micelle formation for absorption, after which they are re-esterified
and packaged into chylomicrons for lymphatic transport. Option A incorrectly suggests
fats enter the portal blood directly; short- and medium-chain fats do, but long-chain fats
enter via the lymphatic system. Preterm infants often have limited bile salt pools, which
complicates lipid absorption.
, Question 5 of 50
A 30-year-old woman participating in a weight-loss study reports intense hunger
cravings late at night despite eating a balanced dinner. Researchers measure her serum
ghrelin and leptin levels.
A. Elevated ghrelin stimulates appetite by acting on the hypothalamus, while leptin
normally signals satiety when energy stores are adequate. ✓ CORRECT
B. High leptin levels indicate her brain is receiving strong satiety signals, so the cravings
are purely behavioral.
C. Ghrelin is secreted by adipose tissue and suppresses hunger when stomach volume
is high.
D. Leptin is produced in the stomach and peaks before meals to trigger meal initiation.
Correct Answer: A
Rationale: Ghrelin, produced primarily in the stomach, rises before meals and stimulates
hunger by activating NPY/AgRP neurons in the hypothalamus, whereas leptin from
adipose tissue signals energy sufficiency. Option B is incorrect because high leptin
would suppress hunger, not explain persistent cravings. Nighttime eating patterns are
often linked to circadian-driven ghrelin peaks that override leptin signaling.
Question 6 of 50
A 55-year-old man with alcoholic cirrhosis presents with low albumin, edema, and easy
bruising. His dietitian notes that his liver's metabolic capacity is severely compromised.
A. The liver has stopped producing glucagon, causing hypoglycemia and impaired
glycogenolysis.
B. The liver synthesizes albumin and clotting factors; cirrhosis impairs protein synthesis
and blood clotting capability. ✓ CORRECT
C. The damaged liver cannot absorb dietary amino acids from the hepatic portal vein.
D. Cirrhosis causes the gallbladder to overproduce bile, leading to fat malabsorption and
bleeding disorders.
