ATI RN
Digestive System Practice Questions Questions
Question 1 of 5
A digestive enzyme, salivary amylase, in the saliva begin digestion of-
Correct Answer: A
Rationale: Salivary amylase (ptyalin) in saliva begins the digestion of carbohydrates by breaking down starches into simpler sugars like maltose.
Question 2 of 5
Which listed substances are all broken down by the liver?
Correct Answer: D
Rationale: The liver metabolizes various substances including urea, alcohol, and drugs.
Question 3 of 5
Which element in the molecule of urea shows that it is formed from amino acids and not from glucose?
Correct Answer: C
Rationale: Nitrogen is a key component of amino acids and is retained in urea during deamination.
Question 4 of 5
An important function of the intestinal villi is to:
Correct Answer: A
Rationale: Intestinal villi are finger-like projections that vastly increase the surface area of the small intestine for nutrient absorption.
Question 5 of 5
What provides the luminal surface of the intestinal wall its characteristics?
Correct Answer: B
Rationale: The luminal surface is smooth and slippery due to mucus secreted by goblet cells in the mucosa, not the peritoneum, which is external.