Digestive System Exam Questions Related

Review Digestive System Exam Questions related questions and content

Which layer of GI tract forms the innermost lining and continuously secretes mucus?

  • A. serosa
  • B. muscularis externa
  • C. muscularis mucosa
  • D. mucosa
Correct Answer: D

Rationale: The mucosa is the innermost layer of the GI tract, lined with epithelial cells that secrete mucus to protect the tract and lubricate food passage.