Question 1

Which layer of the alimentary canal is primarily responsible for absorption and secretion, and also provides protection against pathogens?

Accepted Answer

Mucosa

Question 2

A patient presents with difficulty digesting fats, and imaging reveals a blockage in the pancreatic duct. Which congenital disorder is most likely responsible for this presentation?

Accepted Answer

Cystic fibrosis

Question 3

Which enzyme is responsible for the initial breakdown of starch in the mouth, and what is the product of this reaction?

Accepted Answer

Salivary amylase; oligosaccharides

Question 4

During protein digestion, which enzyme is activated by stomach acid and begins the breakdown of proteins into smaller polypeptides?

Accepted Answer

Pepsin

Question 5

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

Accepted Answer

Lipids are packaged as chylomicrons and enter the lymphatic system via lacteals

Question 6

A patient with chronic alcoholism develops liver cirrhosis. Which of the following changes is most likely to occur in their liver?

Accepted Answer

Shrinkage, fibrosis, and slowed hepatic blood flow

Question 7

Which of the following nutrients requires the presence of intrinsic factor for absorption, and where does this absorption occur?

Accepted Answer

Vitamin B12; ileum

Question 8

If the Na$$^+$$ pump in the epithelial cells of the small intestine is inhibited, which nutrient's absorption would be most directly affected?

Accepted Answer

Glucose

Question 9

Which of the following best explains why patients with pyloric stenosis may experience vomiting of undigested food?

Accepted Answer

The pyloric valve is constricted, preventing passage of solid food into the duodenum

Question 10

Which of the following is a hydrolysis reaction involved in chemical digestion?

Accepted Answer

Splitting a triglyceride into monoglyceride and fatty acids with water

Question 11

A patient with a hiatal hernia is most likely to experience which of the following symptoms?

Accepted Answer

Heartburn due to gastric juice backflow into the esophagus

Question 12

Which of the following statements about the absorption of electrolytes in the small intestine is correct?

Accepted Answer

Na$$^+$$ and Cl$$^-$$ are absorbed by active transport

Question 13

Which of the following enzymes is NOT involved in the final breakdown of oligosaccharides to monosaccharides in the small intestine?

Accepted Answer

Pancreatic amylase

Question 14

A patient is unable to absorb fat-soluble vitamins efficiently. Which process is most likely impaired?

Accepted Answer

Formation of micelles in the small intestine

Question 15

Which of the following best describes the mechanism by which water is absorbed in the small intestine?

Accepted Answer

Osmosis coupled with solute uptake

Question 16

A patient with low blood calcium levels is found to have decreased vitamin D. Which hormone is released to compensate, and what is its effect on the small intestine?

Accepted Answer

Parathyroid hormone (PTH); increases Ca$$^{2+}$$ uptake

Question 17

Which of the following is a correct sequence for the digestion and absorption of proteins?

Accepted Answer

Pepsin in stomach → trypsin in small intestine → aminopeptidase in brush border → amino acids absorbed

Question 18

Which of the following is a plausible consequence of ruptured diverticulitis in the sigmoid colon?

Accepted Answer

Life-threatening infection due to leakage of intestinal contents

Question 19

A patient is diagnosed with gastritis. Which of the following complications is most likely to develop if the condition worsens?

Accepted Answer

Gastric ulcers

Question 20

Which of the following best describes the role of mechanoreceptors and chemoreceptors in the GI tract?

Accepted Answer

They detect stretch, solute concentration, pH, and end products of digestion, initiating reflexes

Chapter 23 Digestive System: Structure, Function, and Developmental Aspects

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