Question 1

Which of the following best describes the primary function of the small intestine?

Accepted Answer

Enzymatic digestion and absorption of water, organic substrates, vitamins, and ions

Question 2

A patient has a deficiency in intrinsic factor production. Which of the following is the most likely consequence?

Accepted Answer

Impaired absorption of vitamin B12

Question 3

Which layer of the digestive tract is primarily responsible for peristalsis and segmentation?

Accepted Answer

Muscular layer

Question 4

During the process of swallowing (deglutition), what prevents food from entering the trachea?

Accepted Answer

Elevation of the larynx and folding of the epiglottis

Question 5

Which hormone is released when chyme enters the duodenum and stimulates the release of pancreatic enzymes and bile?

Accepted Answer

Cholecystokinin (CCK)

Question 6

A patient with a blocked common bile duct would have difficulty digesting which nutrient?

Accepted Answer

Lipids

Question 7

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

Accepted Answer

Absorption of water and vitamins produced by bacteria

Question 8

Which of the following best explains why segmentation in the small intestine is important?

Accepted Answer

It mixes intestinal contents with digestive secretions and increases contact with the mucosa

Question 9

Which of the following enzymes is responsible for the initial breakdown of carbohydrates in the oral cavity?

Accepted Answer

Salivary amylase

Question 10

A patient presents with jaundice and fat malabsorption. Which organ is most likely impaired?

Accepted Answer

Liver

Question 11

Which of the following best describes the role of bile salts in digestion?

Accepted Answer

They emulsify lipids, increasing surface area for enzyme action

Question 12

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

Accepted Answer

Production of digestive enzymes for the stomach

Question 13

Which vitamin produced by bacteria in the colon is essential for blood clotting?

Accepted Answer

Vitamin K

Question 14

Which of the following best describes the process of peristalsis?

Accepted Answer

Waves of muscular contractions that move a bolus along the digestive tract

Question 15

Which structure prevents the intestines from becoming entangled and provides a route for blood vessels, nerves, and lymphatics?

Accepted Answer

Mesenteries

Question 16

A patient with lactose intolerance lacks which enzyme in the brush border of the small intestine?

Accepted Answer

Lactase

Question 17

Which of the following is true regarding the absorption of lipids in the small intestine?

Accepted Answer

Lipids are packaged into chylomicrons and absorbed into lacteals

Question 18

Which of the following best explains why the stomach has an additional oblique muscle layer?

Accepted Answer

To assist with mechanical digestion by mixing and churning contents

Question 19

Which hormone is released in response to fats and carbohydrates entering the small intestine and inhibits gastric activity?

Accepted Answer

Gastric inhibitory peptide (GIP)

Question 20

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

Accepted Answer

Water absorption occurs primarily by passive osmosis

The Digestive System: Structure, Function, and Regulation

Study Guide - Practice Questions