$$\text{Starch} \xrightarrow{\text{amylase}} \text{Maltose}$$

$$\text{Protein} \xrightarrow{\text{pepsin}} \text{Peptides}$$

Question 1

Which of the following best describes the primary function of the esophagus in the digestive process?

Accepted Answer

Transport of food from the mouth to the stomach via peristalsis

Question 2

Salivary amylase initiates the chemical digestion of carbohydrates in the mouth. Which equation best represents the breakdown of starch by amylase?

Accepted Answer

$$	ext{Starch} \xrightarrow{	ext{amylase}} 	ext{Maltose}$$

Question 3

A patient has a condition that impairs the function of the pyloric sphincter. Which of the following is the most likely consequence?

Accepted Answer

Food will pass too quickly from the stomach to the small intestine, potentially causing incomplete digestion.

Question 4

Which feature of the small intestine most directly increases its ability to absorb nutrients efficiently?

Accepted Answer

Presence of villi and microvilli, which increase surface area

Question 5

Which of the following statements about the large intestine is correct?

Accepted Answer

It removes excess water from undigested food, forming solid feces.

Question 6

If the large intestine fails to remove enough water from the undigested food, what is the most likely result?

Accepted Answer

Diarrhea

Question 7

Which of the following best explains why the stomach is able to protect itself from its own acidic environment?

Accepted Answer

Mucus secreted by the stomach lining forms a barrier against acid

Question 8

Which process is responsible for moving food through the esophagus and into the stomach?

Accepted Answer

Peristalsis

Question 9

Which of the following enzymes is primarily responsible for protein digestion in the stomach?

Accepted Answer

Pepsin

Question 10

A student claims that carbohydrate digestion is completed in the mouth. Which of the following best evaluates this claim?

Accepted Answer

Incorrect, because carbohydrate digestion begins in the mouth but is completed in the small intestine.

Question 11

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

Accepted Answer

They complete the final steps of digestion by breaking down nutrients at the surface of the microvilli.

Question 12

Which equation best represents the chemical digestion of proteins in the stomach?

Accepted Answer

$$	ext{Protein} \xrightarrow{	ext{pepsin}} 	ext{Peptides}$$

Question 13

Which of the following is a correct sequence of food movement through the digestive tract?

Accepted Answer

Mouth → Esophagus → Stomach → Small intestine → Large intestine

Question 14

Which of the following statements is true regarding the absorption of nutrients in the digestive tract?

Accepted Answer

Most nutrient absorption occurs in the small intestine due to its large surface area.

Question 15

A patient is unable to produce sufficient gastric acid. Which of the following digestive processes would be most affected?

Accepted Answer

Protein digestion in the stomach

Question 16

Which of the following is a function of the gut microbiome in the large intestine?

Accepted Answer

Fermentation of undigested carbohydrates and synthesis of certain vitamins

Question 17

Which mechanical process in the small intestine helps mix chyme and increase contact with the intestinal wall for absorption?

Accepted Answer

Segmentation

Question 18

If a person’s brush border enzymes are deficient, which of the following is most likely to occur?

Accepted Answer

Incomplete digestion of nutrients at the microvilli, leading to malabsorption

Question 19

Which of the following best describes the role of the pyloric sphincter?

Accepted Answer

Regulates the passage of chyme from the stomach to the small intestine

Question 20

Which of the following is the correct chemical equation for the breakdown of sucrose in the small intestine?

Accepted Answer

$$	ext{Sucrose} \xrightarrow{	ext{sucrase}} 	ext{Glucose} + 	ext{Fructose}$$

Digestive System Organs and Their Roles in Nutrition

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