ATI RN
Digestive System Practice Questions Questions
Question 1 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 2 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 3 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 4 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.
Question 5 of 5
What happens during the gastric phase of digestion?
Correct Answer: B
Rationale: The gastric phase involves the stomach churning food with gastric secretions (e.g., HCl, pepsin) to form chyme.