$$\text{Starch} + \text{H}_2\text{O} \xrightarrow{\text{amylase}} \text{Maltose}$$

Question 1

Which of the following best describes the primary function of the digestive system?

Accepted Answer

To break down food into nutrients that can be absorbed and utilized by the body

Question 2

Which process involves the physical breakdown of food into smaller pieces without changing its chemical structure?

Accepted Answer

Mechanical digestion

Question 3

During chemical digestion, which of the following best describes the role of enzymes?

Accepted Answer

They catalyze the breakdown of macromolecules into absorbable units

Question 4

Which of the following events occurs first during the process of swallowing?

Accepted Answer

The tongue pushes the bolus to the back of the oral cavity

Question 5

A patient is unable to digest proteins efficiently due to a deficiency in stomach enzymes. Which enzyme is most likely deficient?

Accepted Answer

Pepsin

Question 6

Which of the following best explains why the stomach does not digest itself under normal conditions?

Accepted Answer

The stomach lining is protected by a thick layer of mucus

Question 7

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

Accepted Answer

Absorption of nutrients into the bloodstream

Question 8

A patient has a blockage in the common bile duct. Which digestive process is most likely to be impaired?

Accepted Answer

Fat emulsification in the small intestine

Question 9

Which of the following best describes the role of villi in the small intestine?

Accepted Answer

They increase the surface area for nutrient absorption

Question 10

If a person’s pancreas fails to secrete sufficient digestive enzymes, which of the following is most likely to occur?

Accepted Answer

Impaired digestion and absorption of carbohydrates, proteins, and fats

Question 11

Which of the following equations best represents the chemical breakdown of starch by salivary amylase?

Accepted Answer

$$	ext{Starch} + 	ext{H}_2	ext{O} \xrightarrow{	ext{amylase}} 	ext{Maltose}$$

Question 12

Which of the following best describes the defecation reflex?

Accepted Answer

It is initiated by the stretching of the rectal walls, leading to relaxation of the internal anal sphincter

Question 13

Which of the following is a major difference between mechanical and chemical digestion?

Accepted Answer

Mechanical digestion physically breaks down food, while chemical digestion breaks chemical bonds

Question 14

A patient with gallstones blocking the cystic duct would most likely experience difficulty digesting which type of nutrient?

Accepted Answer

Fats

Question 15

Which of the following best explains why peristalsis is important in the digestive tract?

Accepted Answer

It moves food along the digestive tract through coordinated muscle contractions

Question 16

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

Accepted Answer

Absorption of water and formation of feces

Question 17

Which of the following best describes the fate of most nutrients after absorption in the small intestine?

Accepted Answer

They are transported via the hepatic portal vein to the liver

Question 18

Which of the following is a correct sequence of events during the swallowing reflex?

Accepted Answer

Movement of bolus into the pharynx, closure of the epiglottis, peristalsis in the esophagus

Question 19

Which of the following best explains the role of pancreatic juice in digestion?

Accepted Answer

It neutralizes stomach acid and contains enzymes for digesting all major macromolecules

Question 20

A patient with lactose intolerance lacks which digestive enzyme, and what is the result?

Accepted Answer

Lactase; inability to digest lactose, leading to gastrointestinal symptoms

Chapter 14: The Digestive System and Body Metabolism – Study Guide

Study Guide - Practice Questions