Question 1

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

Accepted Answer

Absorption of nutrients and most chemical digestion

Question 2

A patient with a deficiency in intrinsic factor is most likely to develop which of the following conditions?

Accepted Answer

Impaired absorption of vitamin B12 leading to pernicious anemia

Question 3

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

Accepted Answer

Muscularis (muscular layer)

Question 4

A patient presents with jaundice and a history of alcohol abuse. Which of the following best explains the yellowing of the skin?

Accepted Answer

Accumulation of bilirubin due to impaired liver function

Question 5

Which hormone is released in response to acidic chyme entering the duodenum and stimulates the pancreas to release buffers?

Accepted Answer

Secretin

Question 6

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

Accepted Answer

Reabsorption of water and compaction of feces

Question 7

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

Accepted Answer

Lipids

Question 8

Which of the following best describes the role of the myenteric plexus?

Accepted Answer

Coordinates muscular contractions for motility

Question 9

Which of the following is TRUE regarding the difference between multi-unit and visceral smooth muscle?

Accepted Answer

Multi-unit smooth muscle cells are individually innervated, while visceral smooth muscle cells contract together

Question 10

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

Accepted Answer

It mixes intestinal contents with digestive secretions, enhancing absorption

Question 11

A patient with Hirschsprung disease (congenital megacolon) would most likely experience which of the following symptoms?

Accepted Answer

Chronic constipation due to absence of myenteric plexus cells

Question 12

Which of the following structures is responsible for preventing food from entering the nasopharynx during swallowing?

Accepted Answer

Uvula

Question 13

Which of the following is the correct order of the four major layers of the digestive tract, from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscularis, serosa

Question 14

Which of the following best describes the function of bile salts?

Accepted Answer

They emulsify fats, increasing surface area for enzyme action

Question 15

A patient with a shortened lingual frenulum (ankyloglossia) may have difficulty with which of the following?

Accepted Answer

Speaking and breastfeeding

Question 16

Which of the following is a function of the submucosal plexus?

Accepted Answer

Regulates secretion and local blood flow in the digestive tract

Question 17

Which of the following best describes the role of the brush border in the small intestine?

Accepted Answer

It increases surface area and contains enzymes for final digestion

Question 18

Which of the following is the correct sequence for the passage of bile from the liver to the duodenum?

Accepted Answer

Right/left hepatic ducts → common hepatic duct → cystic duct → gallbladder → common bile duct → duodenum

Question 19

Which of the following is a likely consequence of removing the gallbladder?

Accepted Answer

Bile is no longer stored and is released directly into the duodenum

Question 20

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

Accepted Answer

To enhance mixing and churning of food to form chyme

Digestive System: Structure, Function, and Regulation

Study Guide - Practice Questions