How does the epithelial layer vary in different parts of the digestive tract?
The epithelial layer changes along the digestive tract to suit its function:
Esophagus: Lined with stratified squamous non-keratinized epithelium to protect against abrasion. Stomach: Lined with simple columnar epithelium, containing gastric pits and glands for secretion of digestive enzymes and mucus. Small Intestine: Lined with simple columnar epithelium with microvilli and goblet cells to maximize absorption and mucus secretion. Large Intestine: Lined with simple columnar epithelium rich in goblet cells for mucus secretion to facilitate the passage of feces.
