Question 1

Which of the following best describes the primary function of the small intestine in the gastrointestinal tract?

Accepted Answer

Absorption of nutrients and completion of chemical digestion.

Question 2

Which enzyme is responsible for the initial chemical breakdown of carbohydrates in the mouth?

Accepted Answer

Salivary amylase

Question 3

A patient is diagnosed with a deficiency in intrinsic factor. Which nutrient absorption will be most affected?

Accepted Answer

Vitamin B12

Question 4

Which of the following best explains why bile is important for digestion?

Accepted Answer

It emulsifies fats, increasing their surface area for enzyme action.

Question 5

Which of the following is a correct pairing of a digestive hormone with its function?

Accepted Answer

Cholecystokinin (CCK) – stimulates bile release from the gallbladder

Question 6

A person consumes a meal high in carbohydrates. Which transport mechanism is primarily responsible for glucose absorption in the small intestine?

Accepted Answer

Active transport

Question 7

Which of the following best describes the difference between probiotics and prebiotics?

Accepted Answer

Probiotics are live microorganisms that benefit gut health, while prebiotics are dietary components that promote the growth of beneficial microbes.

Question 8

Which of the following is a likely consequence of a weakened lower esophageal sphincter?

Accepted Answer

Heartburn due to acid reflux

Question 9

A patient presents with abdominal pain 1-3 hours after meals and is diagnosed with a gastric ulcer. What is the most likely underlying cause?

Accepted Answer

Helicobacter pylori infection

Question 10

Which of the following best describes the process of segmentation in the small intestine?

Accepted Answer

Rhythmic contractions that mix food with digestive enzymes and break it into smaller pieces

Question 11

Which of the following foods is an example of a synbiotic?

Accepted Answer

Yogurt with bananas

Question 12

Which of the following nutrients is absorbed into the lymphatic system rather than directly into the bloodstream?

Accepted Answer

Fat-soluble vitamins

Question 13

A patient with celiac disease must avoid which of the following foods to prevent damage to their small intestine?

Accepted Answer

Wheat, rye, and barley

Question 14

Which of the following is a function of the gut microbiome?

Accepted Answer

Synthesis of vitamin K and biotin

Question 15

Which of the following best describes the process of passive diffusion in nutrient absorption?

Accepted Answer

Movement of nutrients from high to low concentration without energy

Question 16

A patient complains of infrequent, hard, and painful bowel movements. Which dietary recommendation is most appropriate?

Accepted Answer

Increase intake of high-fiber foods and fluids

Question 17

Which of the following is a likely result of antibiotic overuse on the gastrointestinal tract?

Accepted Answer

Degradation of the gut microbiome, leading to leaky gut

Question 18

Which of the following best explains why short-chain fatty acids produced by gut fermentation are important?

Accepted Answer

They provide energy to colon cells and may protect against colorectal cancer.

Question 19

Which of the following mechanisms requires both a protein carrier and energy (ATP) for nutrient absorption?

Accepted Answer

Active transport

Question 20

A patient with irritable bowel syndrome (IBS) is advised to follow a low-FODMAP diet. What is the primary goal of this dietary intervention?

Accepted Answer

Reduce symptoms such as abdominal cramps, bloating, and irregular bowel movements

The Gastrointestinal System: Digestion, Absorption, and Disorders

Study Guide - Practice Questions