Gastric juice: A mixture of hydrochloric acid, enzymes, and mucus produced by glands in the stomach to aid in digestion and protect against microbes.
Epithelial cells: Cells that line the surfaces of the body, such as skin or organ linings, serving as a barrier and involved in absorption, secretion, and sensation.
Stomach lining: The inner layer of the stomach which contains glands that produce stomach acid and enzymes for digestion