$$\text{AB} + \text{H}_2\text{O} \rightarrow \text{A} + \text{B}$$

$$\text{HCO}_3^- \text{(out)} / \text{Cl}^- \text{(in)}$$

Question 1

Which of the following best describes the function of the alimentary canal in the digestive system?

Accepted Answer

It digests food and absorbs fragments through its lining into the blood.

Question 2

During peristalsis, what is the primary mechanism by which food is moved through the alimentary canal?

Accepted Answer

Alternating waves of contraction and relaxation of adjacent segments.

Question 3

Which of the following is NOT a function of saliva?

Accepted Answer

Absorbs nutrients directly into the bloodstream.

Question 4

A patient presents with difficulty chewing and swallowing, as well as frequent oral infections. Which condition is most likely responsible?

Accepted Answer

Xerostomia

Question 5

Which equation best represents the hydrolysis reaction carried out by digestive enzymes?

Accepted Answer

$$	ext{AB} + 	ext{H}_2	ext{O} ightarrow 	ext{A} + 	ext{B}$$

Question 6

Which cell type in the stomach is responsible for producing hydrochloric acid (HCl)?

Accepted Answer

Parietal cells

Question 7

What is the primary function of bile produced by the liver?

Accepted Answer

Emulsification of fats

Question 8

Which of the following best explains why a meal high in fat delays gastric emptying?

Accepted Answer

Fatty chyme stimulates the release of enterogastrones that inhibit gastric motility.

Question 9

Which structural modification of the small intestine increases its surface area for absorption the most?

Accepted Answer

Microvilli

Question 10

A patient with pernicious anemia is most likely deficient in which substance?

Accepted Answer

Intrinsic factor

Question 11

Which of the following is a plausible consequence of chronic antibiotic use in the large intestine?

Accepted Answer

Overgrowth of Clostridium difficile leading to pseudomembranous colitis

Question 12

Which equation describes the alkaline tide in parietal cells during gastric acid secretion?

Accepted Answer

$$	ext{HCO}_3^- 	ext{(out)} / 	ext{Cl}^- 	ext{(in)}$$

Question 13

Which of the following is a function of the bacterial flora in the large intestine?

Accepted Answer

Fermentation of indigestible carbohydrates

Question 14

Which process is primarily responsible for moving meal remnants, bacteria, and debris toward the large intestine between meals?

Accepted Answer

Peristalsis initiated by motilin

Question 15

Which of the following best describes the role of chylomicrons in lipid absorption?

Accepted Answer

They are formed in intestinal epithelial cells and transported via lymphatic lacteals.

Question 16

Which hormone is released in response to acidic chyme entering the duodenum and stimulates pancreatic juice secretion?

Accepted Answer

Secretin

Question 17

Which of the following is a plausible outcome of a low-fiber diet on the colon?

Accepted Answer

Diverticulosis due to increased pressure on colon walls

Question 18

Which equation best represents the absorption of water in the small intestine?

Accepted Answer

$$	ext{Water uptake} \propto 	ext{Active transport of solutes}$$

Question 19

Which of the following is true regarding the absorption of vitamin B12?

Accepted Answer

It binds with intrinsic factor and is absorbed by endocytosis.

Question 20

Which of the following is a plausible effect of celiac disease on the digestive system?

Accepted Answer

Immune cell damage to intestinal villi and brush border, leading to malabsorption.

The Digestive System: Structure, Function, and Physiology

Study Guide - Practice Questions