$$\text{Water uptake} \propto \text{solute uptake}$$

Question 1

Which of the following best describes the function of the mesentery in the digestive system?

Accepted Answer

It is a double layer of peritoneum that provides routes for blood vessels, lymphatics, and nerves to reach digestive organs.

Question 2

A patient presents with widespread peritonitis. Which of the following is the most immediate danger associated with this condition?

Accepted Answer

Widespread infection leading to sepsis.

Question 3

Which layer of the alimentary canal is primarily responsible for peristalsis and segmentation?

Accepted Answer

Muscularis externa

Question 4

The enteric nervous system, also known as the 'gut brain,' is unique because:

Accepted Answer

It contains more neurons than the spinal cord and can function independently of the central nervous system.

Question 5

Which of the following equations correctly represents the absorption of water in the small intestine?

Accepted Answer

$$	ext{Water uptake} \propto 	ext{solute uptake}$$

Question 6

A patient with pernicious anemia is most likely deficient in which of the following processes?

Accepted Answer

Absorption of vitamin B$$_{12}$$ due to lack of intrinsic factor.

Question 7

Which hormone stimulates the release of bile and pancreatic enzymes in response to fatty chyme entering the small intestine?

Accepted Answer

Cholecystokinin (CCK)

Question 8

Which of the following is a correct sequence of events during the cephalic phase of gastric secretion?

Accepted Answer

Sight, taste, smell, or thought of food → cerebral cortex → hypothalamus → medulla oblongata → vagus nerves

Question 9

Which of the following best explains why a low-fiber diet can lead to diverticulosis?

Accepted Answer

Low fiber increases pressure on colon walls, leading to herniations of mucosa.

Question 10

Which of the following is a function of the liver in digestion?

Accepted Answer

Production of bile to emulsify fats.

Question 11

A patient with chronic heartburn is at risk for which of the following complications?

Accepted Answer

Esophageal ulcers and increased risk of esophageal cancer.

Question 12

Which of the following best describes the absorption of iron in the digestive tract?

Accepted Answer

Iron is stored in mucosal cells with ferritin and transported in blood by transferrin when needed.

Question 13

Which of the following is a plausible consequence of antibiotic-associated diarrhea caused by Clostridium difficile?

Accepted Answer

Pseudomembranous colitis and possible bowel perforation.

Question 14

Which of the following correctly matches the digestive organ with its primary function?

Accepted Answer

Gallbladder: storage of bile

Question 15

Which of the following best explains the role of the mucosa layer in the alimentary canal?

Accepted Answer

It secretes, absorbs, and protects the digestive tract.

Question 16

Which of the following is a correct statement about vitamin absorption in the digestive tract?

Accepted Answer

Fat-soluble vitamins (A, D, E, K) are carried by micelles and diffuse into absorptive cells.

Question 17

Which of the following is a plausible effect of excessive vomiting (emesis)?

Accepted Answer

Dehydration and electrolyte imbalance leading to alkalosis.

Question 18

Which of the following best describes the function of the enteric bacteria in the large intestine?

Accepted Answer

They produce some vitamin K and B vitamins and aid in digestion of remaining food residues.

Question 19

Which of the following is a correct equation for the net movement of water in the intestine?

Accepted Answer

$$	ext{Net osmosis occurs if concentration gradient is established by active transport of solutes}$$

The Digestive System: Structure, Function, and Regulation

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