Question 1

Which of the following best describes the dual function of the pancreas in the digestive system?

Accepted Answer

It acts as both an exocrine organ (secreting pancreatic juice) and an endocrine organ (secreting insulin and glucagon).

Question 2

A patient presents with severe abdominal pain and is diagnosed with pancreatitis. Which of the following best explains the pathophysiology of this condition?

Accepted Answer

Premature activation of pancreatic proteolytic enzymes leads to autodigestion of the pancreas.

Question 3

Which of the following enzymes is secreted by the pancreas as an inactive zymogen and is activated in the small intestine?

Accepted Answer

Trypsinogen

Question 4

What is the primary function of the circular folds (plicae circulares) in the small intestine?

Accepted Answer

To amplify the absorptive surface area and slow the movement of chyme for optimal absorption

Question 5

A patient with lactose intolerance lacks which of the following enzymes, and what is the physiological consequence?

Accepted Answer

Lactase; undigested lactose draws water into the lumen, causing bloating and diarrhea

Question 6

Which of the following best describes the absorption pathway of triglycerides after digestion in the small intestine?

Accepted Answer

They are packaged into chylomicrons, enter lacteals, and are transported via the lymphatic system to the thoracic duct.

Question 7

Which of the following statements about the large intestine is correct?

Accepted Answer

It functions primarily to reabsorb water and store feces.

Question 8

A patient with celiac disease experiences malabsorption due to immune-mediated damage to which structure?

Accepted Answer

Intestinal villi

Question 9

Which of the following best explains why a high-fiber diet reduces the risk of diverticulosis?

Accepted Answer

Fiber decreases colonic pressure by increasing stool bulk, reducing the formation of diverticula.

Question 10

Which vitamin is synthesized by bacterial flora in the large intestine and is essential for blood clotting?

Accepted Answer

Vitamin K

Question 11

A patient is prescribed Orlistat for weight loss. What is the mechanism of action of this drug?

Accepted Answer

It inhibits pancreatic lipase, reducing lipid absorption in the small intestine.

Question 12

Which of the following is true regarding the absorption of vitamin B12?

Accepted Answer

It requires binding to intrinsic factor and is absorbed in the ileum.

Question 13

Which of the following best describes the defecation reflex?

Accepted Answer

It is triggered by stretching of the rectal wall, leading to contraction of the rectum and relaxation of the internal anal sphincter.

Question 14

Which of the following is a correct sequence for the activation of pancreatic proteases in the small intestine?

Accepted Answer

Trypsinogen is activated to trypsin by membrane-bound enterokinase; trypsin then activates chymotrypsinogen and procarboxypeptidase.

Question 15

A patient with iron-deficiency anemia is found to have impaired absorption in the GI tract. Where does iron absorption primarily occur, and what protein stores iron in the epithelial cells?

Accepted Answer

Duodenum; ferritin

Question 16

Which of the following best explains the pathophysiology of gout related to nucleic acid digestion?

Accepted Answer

Purines are deaminated and excreted as uric acid, which can precipitate in tissues if plasma levels are high.

Question 17

Which of the following is a function of Peyer’s patches in the small intestine?

Accepted Answer

Immune surveillance and protection against foreign microorganisms

Question 18

Which of the following best describes the role of bile salts in lipid digestion?

Accepted Answer

They emulsify fats, increasing the surface area for pancreatic lipase action.

Question 19

Which of the following is a distinguishing histological feature of the large intestine compared to the small intestine?

Accepted Answer

Deep crypts with numerous goblet cells

Digestive System: Pancreas, Small Intestine, and Large Intestine

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