Question 1

Which of the following best describes the primary function of the alimentary canal?

Accepted Answer

To digest and absorb food as it passes through a continuous muscular tube

Question 2

During which digestive process is food moved through the gastrointestinal tract by peristalsis?

Accepted Answer

Propulsion

Question 3

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

Accepted Answer

Anchoring the liver to the diaphragm

Question 4

A patient has a blockage in the hepatic portal vein. Which of the following is most likely to be impaired?

Accepted Answer

Transport of absorbed nutrients from the digestive tract to the liver

Question 5

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

Accepted Answer

Muscularis externa

Question 6

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

Accepted Answer

It consists of two major nerve plexuses that regulate digestive tract motility and secretion

Question 7

A person is unable to produce salivary amylase. Which digestive process will be most directly affected?

Accepted Answer

Initial breakdown of starches in the mouth

Question 8

Which of the following best explains the 'alkaline tide' that occurs after a meal?

Accepted Answer

Transport of $$ \mathrm{$$HCO_3$$^-} $$ into the blood as $$ \mathrm{H^+}  is $$secreted into the stomach lumen

Question 9

Which of the following is a correct sequence of events during swallowing (deglutition)?

Accepted Answer

Buccal phase (voluntary) followed by pharyngeal-esophageal phase (involuntary)

Question 10

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

Accepted Answer

Production of bile, detoxification, and storage of fat-soluble vitamins

Question 11

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

Accepted Answer

Impaired absorption of vitamin B12 in the small intestine

Question 12

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

Accepted Answer

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

Question 13

Which of the following statements about the absorption of carbohydrates in the small intestine is correct?

Accepted Answer

Monosaccharides are co-transported with sodium ions across the apical membrane

Question 14

Which of the following is a unique feature of the large intestine compared to the small intestine?

Accepted Answer

Thick mucosa with numerous goblet cells and the presence of teniae coli

Question 15

A patient with a damaged myenteric plexus would most likely experience which of the following symptoms?

Accepted Answer

Impaired motility and peristalsis in the GI tract

Question 16

Which hormone is primarily responsible for stimulating the release of pancreatic enzymes and contraction of the gallbladder?

Accepted Answer

Cholecystokinin (CCK)

Question 17

Which of the following best explains why most digestive enzymes are secreted in an inactive form?

Accepted Answer

To prevent premature digestion of the organ's own tissues

Question 18

Which of the following is a correct description of the process by which fats are absorbed in the small intestine?

Accepted Answer

Chylomicrons are formed in epithelial cells and enter lacteals for transport

Question 19

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

Accepted Answer

Fermentation of indigestible carbohydrates and synthesis of vitamins B and K

Question 20

A patient is unable to absorb calcium and iron efficiently. Which part of the digestive tract is most likely affected?

Accepted Answer

Duodenum

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

Study Guide - Practice Questions