ATI RN
Digestive System Practice Questions Questions
Question 1 of 5
What is the role of mucus secreted by the stomach?
Correct Answer: A
Rationale: Mucus or Gastric mucus is a gel barrier secreted by epithelial cells & glandular cells in the stomach wall. It protects the inner lining of the stomach from HCl.
Question 2 of 5
Which features make a villus well adapted for absorbing amino acids from the ileum?
Correct Answer: B
Rationale: Villi have a large surface area to volume ratio, good blood supply, and thin walls, facilitating efficient absorption of nutrients such as amino acids.
Question 3 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 4 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 5 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.