Question 1

Which of the following best describes the role of the muscularis externa in the esophagus during swallowing?

Accepted Answer

It contracts to push food down the esophagus via peristalsis.

Question 2

A patient is unable to properly digest fats. Which organ is most likely malfunctioning, and why?

Accepted Answer

The liver, because it produces bile which emulsifies fats.

Question 3

Which process is responsible for mixing intestinal contents by alternating contractions of the circular muscle layer?

Accepted Answer

Segmentation

Question 4

If the pyloric sphincter fails to open, which of the following would most likely occur?

Accepted Answer

Food would not pass from the stomach to the small intestine.

Question 5

Which of the following enzymes is produced in the pancreas and is responsible for digesting proteins?

Accepted Answer

Trypsin

Question 6

A patient presents with abnormally soft feces. Which of the following is the most likely explanation?

Accepted Answer

Chyme moved too quickly through the large intestine, reducing water absorption.

Question 7

Which of the following best describes the function of bile salts in digestion?

Accepted Answer

They emulsify lipids into smaller droplets to aid lipase action.

Question 8

Which cell type in the small intestine is primarily responsible for absorption?

Accepted Answer

Enterocytes

Question 9

Which of the following is TRUE regarding the movement of food through the alimentary canal?

Accepted Answer

Propulsion is the process of pushing food through the canal via peristalsis.

Question 10

Which of the following statements about brush border enzymes is correct?

Accepted Answer

They break down carbohydrates into disaccharides and monosaccharides.

Question 11

A patient has a blockage in the common bile duct. Which digestive process would be most affected?

Accepted Answer

Emulsification of dietary fats

Question 12

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

Accepted Answer

Production of digestive enzymes for the small intestine

Question 13

Which of the following best explains why segmentation is important in the small intestine?

Accepted Answer

It mixes intestinal contents to enhance nutrient absorption.

Question 14

Which of the following is the correct sequence of sphincters that food passes through from the esophagus to the small intestine?

Accepted Answer

Upper esophageal sphincter, lower esophageal sphincter, pyloric sphincter

Question 15

Which of the following best describes the function of goblet cells in the small intestine?

Accepted Answer

They produce mucus to lubricate and protect the intestinal lining.

Question 16

Which of the following is a correct statement about the absorption of sugars in the small intestine?

Accepted Answer

Complex sugars are broken down by amylase and brush border enzymes into monosaccharides before absorption.

Question 17

Which of the following best explains the role of the diaphragm during defecation?

Accepted Answer

It contracts to increase abdominal pressure, aiding in the expulsion of feces.

Question 18

Which of the following is the main digestive enzyme produced in saliva, and what is its function?

Accepted Answer

Amylase; it breaks down starches into smaller carbohydrates.

Question 19

If a person’s small intestine surface area is reduced due to disease, which of the following would most likely occur?

Accepted Answer

Decreased nutrient absorption leading to malnutrition.

Question 20

Which of the following equations best represents the breakdown of a disaccharide by brush border enzymes?

Accepted Answer

$$ 	ext{Maltose} + 	ext{Maltase} ightarrow 2 	ext{Glucose} $$

Digestive System: Structure, Function, and Physiology

Guida di studio - Domande di pratica