Question 1

Which of the following correctly lists the four layers of the alimentary canal from innermost to outermost, and matches each with its primary function?

Accepted Answer

Mucosa (secretion and absorption), Submucosa (vascular supply and support), Muscularis externa (motility), Serosa (protection)

Question 2

Which of the following organs is NOT considered retroperitoneal?

Accepted Answer

Stomach

Question 3

A patient with a blocked common bile duct would have difficulty digesting which type of nutrient, and why?

Accepted Answer

Lipids, because bile emulsifies fats to increase surface area for lipase action

Question 4

Which cell type in the gastric glands secretes hydrochloric acid, and what is the primary function of this secretion?

Accepted Answer

Parietal cells; to activate pepsinogen and destroy pathogens

Question 5

During swallowing, which structure prevents food from entering the nasal cavity?

Accepted Answer

Soft palate

Question 6

Which enzyme is responsible for the initial chemical digestion of carbohydrates in the mouth, and what is its substrate?

Accepted Answer

Salivary amylase; starch

Question 7

A patient with liver cirrhosis has impaired production of bile. Which digestive process is most directly affected?

Accepted Answer

Emulsification of fats

Question 8

Which of the following best describes the role of the gallbladder in digestion?

Accepted Answer

It stores and concentrates bile, releasing it into the duodenum

Question 9

Which of the following is a major process of the digestive system that involves the movement of nutrients from the lumen of the GI tract into the blood or lymph?

Accepted Answer

Absorption

Question 10

Which of the following statements about the peritoneum is correct?

Accepted Answer

It is a serous membrane that lines the abdominal cavity and covers abdominal organs

Question 11

Which of the following best describes the histological structure of the liver?

Accepted Answer

It is organized into lobules with central veins and radiating hepatocytes

Question 12

Which enzyme, secreted by the pancreas, is responsible for digesting proteins in the small intestine?

Accepted Answer

Trypsin

Question 13

A patient is unable to produce sufficient mucus in the stomach. Which layer of the alimentary canal is most likely affected, and what is a likely consequence?

Accepted Answer

Mucosa; increased risk of gastric ulcers

Question 14

Which of the following is NOT an accessory organ of the digestive system?

Accepted Answer

Jejunum

Question 15

Which process involves the coordinated contraction and relaxation of the muscularis externa to propel food through the digestive tract?

Accepted Answer

Peristalsis

Question 16

Which of the following best explains why pancreatic juice is alkaline?

Accepted Answer

It neutralizes acidic chyme entering the duodenum

Question 17

Which of the following enzymes is responsible for the digestion of fats, and where is it primarily active?

Accepted Answer

Pancreatic lipase; small intestine

Question 18

A patient with a tumor compressing the submucosal plexus of the small intestine would most likely experience which of the following symptoms?

Accepted Answer

Decreased secretion of digestive enzymes and fluids

Question 19

Which of the following best describes the mechanism of swallowing (deglutition)?

Accepted Answer

It is initiated voluntarily but completed by involuntary reflexes involving the pharynx and esophagus

Question 20

Which of the following pairs correctly matches a digestive enzyme with its substrate?

Accepted Answer

Lactase – lactose

Digestive System Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions

Study Guide - Flashcards