Question 1

Which of the following best describes the primary function of the muscularis layer in the gastrointestinal (GI) tract?

Accepted Answer

It is responsible for mixing and propelling contents through the GI tract via peristalsis and segmentation.

Question 2

A patient with a deficiency in intrinsic factor is most likely to develop which of the following conditions?

Accepted Answer

Pernicious anemia

Question 3

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

Accepted Answer

It coordinates local reflexes such as mixing and propulsion independently of the central nervous system.

Question 4

Which structure must substances cross to enter the blood or lymphatic capillaries during absorption in the small intestine?

Accepted Answer

Simple columnar epithelium of the mucosa

Question 5

A patient presents with severe right upper quadrant pain after eating a fatty meal. Imaging reveals gallstones. Which hormone is most likely responsible for stimulating the gallbladder to contract and release bile?

Accepted Answer

Cholecystokinin (CCK)

Question 6

Which of the following best explains why pepsin is secreted as an inactive precursor (pepsinogen) in the stomach?

Accepted Answer

To prevent the enzyme from digesting proteins within the cells that produce it.

Question 7

Which of the following is a function of bile salts in the digestive process?

Accepted Answer

They emulsify large lipid droplets into smaller droplets, increasing surface area for pancreatic lipase.

Question 8

Which of the following best describes the difference between mechanical and chemical digestion?

Accepted Answer

Mechanical digestion physically breaks down food, while chemical digestion uses enzymes to break chemical bonds.

Question 9

A patient with chronic reflux esophagitis is at increased risk for which of the following complications?

Accepted Answer

Barrett esophagus, which increases the risk of esophageal cancer

Question 10

Which of the following is the correct sequence of layers (tunics) from innermost to outermost in the wall of the GI tract?

Accepted Answer

Mucosa, submucosa, muscularis, serosa/adventitia

Question 11

Which of the following best describes the role of the brush border enzymes in the small intestine?

Accepted Answer

They complete the chemical digestion of carbohydrates and peptides at the surface of enterocytes.

Question 12

Which of the following is a correct statement about the absorption of vitamin B12?

Accepted Answer

It requires intrinsic factor and is absorbed in the ileum by receptor-mediated endocytosis.

Question 13

Which of the following best explains the function of the ileocecal valve?

Accepted Answer

It prevents the backflow of fecal material from the large intestine into the small intestine.

Question 14

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

Accepted Answer

Absorption of water and electrolytes, and formation of feces

Question 15

A patient with a low-fiber diet develops small bulges in the intestinal lining. What is the most likely diagnosis?

Accepted Answer

Diverticulosis

Question 16

Which of the following best describes the process of peristalsis?

Accepted Answer

A series of coordinated, wave-like contractions that propel contents through the GI tract

Question 17

Which of the following is a correct pairing of a digestive enzyme and its substrate?

Accepted Answer

Lingual lipase – triglycerides

Question 18

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

Accepted Answer

Breakdown of undigested carbohydrates and synthesis of vitamins B and K

Question 19

Which of the following best describes the role of chylomicrons in lipid absorption?

Accepted Answer

They transport re-formed triglycerides from intestinal epithelial cells into lacteals for delivery to the bloodstream.

Question 20

Which hormone is released from the small intestine in response to acidic chyme and stimulates the release of alkaline secretions from the pancreas and liver?

Accepted Answer

Secretin

Digestive System: Structure, Function, and Regulation

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