Question 1

Which of the following best describes the primary function of bile salts in the digestive process?

Accepted Answer

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

Question 2

A patient presents with pernicious anemia. Which of the following is most likely deficient in this patient, and what is the physiological consequence?

Accepted Answer

Intrinsic factor; inability to absorb vitamin B12

Question 3

Which of the following statements about the enteric nervous system is correct?

Accepted Answer

It contains more neurons than the spinal cord and regulates gut motility independently.

Question 4

During swallowing, which structure prevents food from entering the larynx and trachea?

Accepted Answer

Epiglottis

Question 5

Which of the following best explains why chief cells secrete pepsinogen instead of pepsin?

Accepted Answer

Pepsin would digest the chief cells' own proteins if secreted in its active form.

Question 6

A patient taking NSAIDs develops a gastric ulcer. What is the most likely mechanism by which NSAIDs contribute to ulcer formation?

Accepted Answer

They inhibit prostaglandin synthesis, reducing protective mucus in the stomach.

Question 7

Which of the following is the correct sequence for the digestion of carbohydrates?

Accepted Answer

Salivary amylase → Pancreatic amylase → Brush border enzymes

Question 8

Which hormone stimulates the secretion of gastric acid by parietal cells?

Accepted Answer

Gastrin

Question 9

A patient with type 1 diabetes mellitus is unable to produce insulin. Which cells in the pancreas are responsible for insulin secretion?

Accepted Answer

Beta cells in the islets of Langerhans

Question 10

Which of the following best describes the process of peristalsis?

Accepted Answer

Directional wave of contraction and relaxation of smooth muscle that propels food forward

Question 11

Which of the following is a function of the large intestine?

Accepted Answer

Absorption of remaining water and salt from food residue

Question 12

Which of the following best explains why emulsification by bile salts is important for lipid digestion?

Accepted Answer

It increases the surface area of fat droplets for pancreatic lipase action.

Question 13

Which of the following is the correct pathway for the absorption of most dietary lipids?

Accepted Answer

Into enterocytes by simple diffusion, formation of chylomicrons, then exocytosis into lacteals

Question 14

Which of the following best describes the role of the vagus nerve in digestion?

Accepted Answer

It increases digestive activity by stimulating the parasympathetic nervous system.

Question 15

Which of the following is a correct statement about the absorption of monosaccharides in the small intestine?

Accepted Answer

Monosaccharides are absorbed by sodium-dependent cotransport (SGLT1) at the apical membrane.

Question 16

A patient has a mutation that prevents the secretion of secretin. Which of the following digestive processes would be most directly affected?

Accepted Answer

Secretion of bicarbonate-rich fluid from the pancreas

Question 17

Which of the following best describes the function of brush border enzymes?

Accepted Answer

They are membrane-bound enzymes that complete the digestion of carbohydrates and proteins at the surface of enterocytes.

Question 18

Which of the following is a direct result of the negative feedback loop involving insulin and glucagon?

Accepted Answer

Blood glucose levels are regulated and maintained within a narrow range.

Question 19

Which of the following is a function of the gut microbiome in the large intestine?

Accepted Answer

Metabolic functions and influence on weight, disease susceptibility, and mood

Question 20

Which of the following best describes the process of segmentation in the digestive tract?

Accepted Answer

Coordinated, nondirectional contraction and relaxation of smooth muscle that mixes food with digestive juices

Chapter 23: The Digestive System – Structure, Function, and Physiology

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