$$\text{Large molecule} + \text{H}_2\text{O} \rightarrow \text{Small molecules}$$

Question 1

Which of the following best describes the function of the intrinsic factor produced by the stomach?

Accepted Answer

It is required for the absorption of vitamin B12 in the small intestine.

Question 2

A patient presents with difficulty absorbing fat-soluble vitamins. Which organ is most likely impaired, and why?

Accepted Answer

Gallbladder, because it stores and concentrates bile needed for fat emulsification.

Question 3

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

Accepted Answer

Muscularis externa

Question 4

During swallowing, which phase is initiated voluntarily and involves the movement of the bolus into the pharynx?

Accepted Answer

Buccal phase

Question 5

Which of the following statements about the histology of the small intestine is correct?

Accepted Answer

The small intestine contains plicae circulares and villi to increase surface area for absorption.

Question 6

A patient has a deficiency in vitamin K due to impaired absorption in the large intestine. What is the most likely cause?

Accepted Answer

Reduced activity of normal bacterial flora in the colon.

Question 7

Which of the following best explains why water absorption in the digestive tract is passive?

Accepted Answer

Water absorption occurs down osmotic gradients created by electrolyte movement.

Question 8

Which enzyme is responsible for the breakdown of starches in both the oral cavity and the pancreas?

Accepted Answer

Pancreatic alpha-amylase

Question 9

A patient with cholelithiasis (gallstones) is most likely to experience which of the following complications?

Accepted Answer

Obstruction of bile flow, leading to impaired fat digestion.

Question 10

Which of the following correctly matches the type of epithelium with its location in the digestive tract?

Accepted Answer

Stratified squamous epithelium in the esophagus.

Question 11

Which reflex is responsible for moving materials from the small intestine into the large intestine?

Accepted Answer

Gastroileal reflex

Question 12

A patient with decreased secretion of hydrochloric acid in the stomach would most likely have impaired activation of which enzyme?

Accepted Answer

Pepsin

Question 13

Which of the following is a function of the colon that distinguishes it from the small intestine?

Accepted Answer

Compaction of intestinal contents into feces.

Question 14

Which equation best represents the hydrolysis reaction catalyzed by digestive enzymes?

Accepted Answer

$$	ext{Large molecule} + 	ext{H}_2	ext{O} ightarrow 	ext{Small molecules}$$

Question 15

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

Accepted Answer

Production of digestive enzymes for protein breakdown

Question 16

A patient with a damaged ileocecal valve would most likely experience which of the following?

Accepted Answer

Uncontrolled flow of material from the ileum into the large intestine.

Question 17

Which of the following best describes the process of segmentation in the digestive tract?

Accepted Answer

Cycles of contraction that churn and fragment the bolus, mixing contents with secretions.

Question 18

Which vitamin produced by bacteria in the colon is essential for the synthesis of clotting factors in the liver?

Accepted Answer

Vitamin K

Question 19

A patient with impaired function of the pancreatic acini would most likely have difficulty digesting which of the following?

Accepted Answer

Nucleic acids, proteins, and lipids

Question 20

Which of the following equations best represents the relationship between nutrient absorption and ATP synthesis?

Accepted Answer

$$	ext{Nutrients} ightarrow 	ext{ATP} + 	ext{Waste products}$$

The Digestive System: Structure, Function, and Physiology

Study Guide - Practice Questions