The layer of the digestive tract that is composed of stratified and columnar epithelium is the
A) serosa
B) muscularis
C) submucosa
D) mucosa

Question

Quizplus · Accepted Answer

The mucosa is the layer of the digestive tract that is closest to the food bolus, and is composed of stratified and columnar epithelium that secretes enzymes and mucus to aid in digestion and absorption. The serosa is the outermost layer that serves as the protective covering of the digestive tract, while the muscularis is the layer responsible for the peristaltic movements that move the food through the digestive tract. The submucosa is the layer that contains blood vessels, nerves, and lymphatic vessels that support the function of the mucosa and muscularis layers.

The Layer of the Digestive Tract That Is Composed of Stratified