Question 1

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

Accepted Answer

Bile emulsifies fats, breaking them into smaller droplets to aid pancreatic lipase activity.

Question 2

A patient has difficulty absorbing vitamin B12. Which of the following is most likely impaired?

Accepted Answer

Parietal cell secretion of intrinsic factor

Question 3

Which layer of the gastrointestinal tract is primarily responsible for peristalsis?

Accepted Answer

Muscularis externa

Question 4

Which enzyme is responsible for the initial chemical digestion of starch in the mouth?

Accepted Answer

Salivary amylase

Question 5

A patient has a blockage at the hepatopancreatic ampulla. Which of the following processes would be most directly affected?

Accepted Answer

Emulsification of fats and neutralization of acidic chyme in the duodenum

Question 6

Which of the following best explains why the stomach has three layers of muscle in its muscularis externa?

Accepted Answer

To enhance the mechanical churning and mixing of food with gastric juice

Question 7

Which hormone is released in response to fatty acids in the duodenum and stimulates the release of bile from the gallbladder?

Accepted Answer

Cholecystokinin (CCK)

Question 8

Which of the following is the correct sequence of structures that food passes through after leaving the stomach?

Accepted Answer

Duodenum → Jejunum → Ileum → Cecum → Ascending colon

Question 9

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

Accepted Answer

Monosaccharides and amino acids are absorbed into blood capillaries and transported to the liver via the portal vein.

Question 10

Which of the following best describes the role of the hepatic portal vein?

Accepted Answer

It carries deoxygenated, nutrient-rich blood from the digestive organs to the liver.

Question 11

Which of the following cell types in the small intestine is responsible for secreting antimicrobial proteins?

Accepted Answer

Paneth cells

Question 12

A patient is unable to voluntarily control defecation. Which structure is most likely damaged?

Accepted Answer

External anal sphincter

Question 13

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

Accepted Answer

To protect against abrasion from food boluses

Question 14

Which of the following enzymes is responsible for the final step of carbohydrate digestion at the brush border of the small intestine?

Accepted Answer

Brush border disaccharidases

Question 15

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

Accepted Answer

Absorption of water and electrolytes

Question 16

Which of the following best describes the function of the gallbladder?

Accepted Answer

It stores and concentrates bile between meals.

Question 17

Which of the following is the correct match between a macromolecule and its digestive enzyme?

Accepted Answer

Fat – Lipase

Question 18

Which of the following best explains the role of Peyer’s patches in the small intestine?

Accepted Answer

They sample absorbed material for pathogens as part of the immune system.

Question 19

Which of the following is a correct statement about the control of salivary secretion?

Accepted Answer

It is stimulated by the sight, smell, thought, and taste of food.

Question 20

Which of the following best describes the fate of long-chain fatty acids after absorption in the small intestine?

Accepted Answer

They are absorbed into lacteals and transported via the lymphatic system.

Digestive System: Structure, Function, and Processes

Study Guide - Practice Questions