Question 1

Which of the following best describes the primary function of the oblique muscle layer in the stomach?

Accepted Answer

It churns, mixes, and pummels food into smaller fragments to aid in mechanical digestion.

Question 2

A patient presents with a hiatal hernia. Through which anatomical structure does the esophagus pass that is associated with this condition?

Accepted Answer

Esophageal hiatus in the diaphragm

Question 3

Which cell type in the gastric glands is responsible for secreting pepsinogen, and what is its role in digestion?

Accepted Answer

Chief cells; pepsinogen is activated to pepsin by HCl to digest proteins.

Question 4

Which of the following structural modifications of the small intestine is correctly matched with its function?

Accepted Answer

Plicae circulares – increase surface area for absorption by forming permanent circular folds.

Question 5

A patient with a genetic defect in tight junction proteins in the stomach epithelium would most likely experience which of the following?

Accepted Answer

Increased permeability to hydrochloric acid, leading to mucosal damage.

Question 6

Which of the following best explains why most nutrient absorption occurs in the proximal jejunum?

Accepted Answer

The proximal jejunum contains the highest density of villi and microvilli, maximizing surface area for absorption.

Question 7

Which of the following is NOT a function of hepatocytes in the liver?

Accepted Answer

Secretion of pepsinogen

Question 8

A patient has a blockage at the porta hepatis. Which of the following structures would NOT be directly affected?

Accepted Answer

Pyloric sphincter

Question 9

Which of the following best describes the role of Kupffer cells in the liver?

Accepted Answer

They are hepatic macrophages that remove debris and pathogens from blood in the liver sinusoids.

Question 10

If the pyloric sphincter fails to function properly, which of the following is a likely consequence?

Accepted Answer

Unregulated release of chyme into the duodenum, potentially causing duodenal ulcers.

Question 11

Which of the following best explains why the esophagus is lined with nonkeratinized stratified squamous epithelium?

Accepted Answer

To protect against abrasion from food boluses during swallowing.

Question 12

Which of the following correctly matches a gastric gland cell with its secretion and function?

Accepted Answer

Parietal cell – secretes HCl and intrinsic factor; HCl activates pepsinogen and intrinsic factor aids vitamin B12 absorption.

Question 13

Which of the following is a direct result of the pacemaker cells in the stomach?

Accepted Answer

They set the constant rhythm of gastric mixing and peristalsis.

Question 14

A patient with damage to the intestinal crypts (crypts of Lieberkühn) would most likely experience which of the following?

Accepted Answer

Reduced replacement of absorptive cells, leading to impaired nutrient absorption.

Question 15

Which of the following best describes the function of the portal triad in the liver lobule?

Accepted Answer

It consists of a bile duct, hepatic artery, and hepatic portal vein, each serving a different role in liver function.

Question 16

Which of the following is the correct sequence of regions food passes through in the stomach?

Accepted Answer

Cardia → Fundus → Body → Pyloric region

Question 17

Which of the following best explains the importance of the bicarbonate-rich mucus secreted by the stomach lining?

Accepted Answer

It neutralizes stomach acid at the epithelial surface, protecting the mucosa from autodigestion.

Question 18

A patient with impaired function of the ileocecal valve would most likely experience which of the following?

Accepted Answer

Backflow of large intestinal contents into the ileum, increasing risk of infection.

Question 19

Which of the following best describes the function of the villi in the small intestine?

Accepted Answer

They contain blood capillaries and lacteals to absorb nutrients and lipids.

The Digestive System: Esophagus, Stomach, Small Intestine, and Liver

Study Guide - Practice Questions