Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
The mucosal barrier is a protective layer that lines the stomach, preventing the acidic gastric juices from damaging the stomach walls. It consists of mucus, bicarbonate ions, and epithelial cells that work together to prevent ulceration.
Related terms
Gastric Acid: A digestive fluid formed in the stomach, composed mainly of hydrochloric acid and enzymes necessary for food breakdown.