In a histology section of the digestive tract, you observe that the mucosa is made of simple columnar epithelium and the tissue has three layers of smooth muscles. this section represents

Out of the following given choices;

stomach

duodenum

large intestine

esophagus

The answer is duodenum. This region’s (of the gastrointestinal tract) mucosal layer is composed of three layers; epithelium, lamina propria, and muscularis mucosae. Muscularis mucosae is the layer of smooth muscle. The epithelium is composed of simple columnar cells (aka enterocytes) with a brush border and interspersed goblet cells.

c. is the correct answer