ATI LPN
NCLEX Questions Gastrointestinal System Questions
Question 1 of 5
Which of the following regions of the GI tract is not characterized by simple columnar epithelium on the mucosal surface?
Correct Answer: D
Rationale: The correct answer is D: anal canal. The anal canal is not characterized by simple columnar epithelium on the mucosal surface. Instead, it is lined by stratified squamous epithelium, which is more suited to withstand the mechanical stress associated with the passage of feces. The stomach (A), small intestine (B), and appendix (C) all have simple columnar epithelium to facilitate absorption and secretion. Therefore, the anal canal is the only region among the choices that does not have simple columnar epithelium, making it the correct answer.
Question 2 of 5
The parotid gland and the pancreas are both compound acinar glands, served by a branching duct system. Morphological differences between parotid and pancreas include which of the following?
Correct Answer: D
Rationale: All listed features distinguish the pancreas (endocrine islets, centroacinar cells) from the parotid (adipocytes).
Question 3 of 5
The length of intestinal villi is about:
Correct Answer: B
Rationale: Villi are approximately 0.5-1 mm long, enhancing absorption.
Question 4 of 5
Cells which secrete HCl into the stomach are called:
Correct Answer: C
Rationale: Parietal cells secrete hydrochloric acid.
Question 5 of 5
The principal function for intestinal enteroendocrine cells is:
Correct Answer: B
Rationale: Enteroendocrine cells secrete hormones like CCK and secretin.