Multiple choice

The lumen of the GI tract is lined with what tissue layer?

  1. Mucosa

  2. Submucosa

  3. Muscularis externa

  4. Serosa

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The mucosa is the innermost layer of the gastrointestinal tract that lines the lumen. It consists of an epithelial lining, a lamina propria, and a thin layer of smooth muscle.