Gastric acid: A digestive fluid, produced by the stomach, that contains hydrochloric acid and digestive enzymes, critical for breaking down proteins and killing potential harmful bacteria ingested with food.
Pepsin:An enzyme in the stomach that breaks down proteins into smaller peptides, essential for protein digestion.
Chyme:The semi-liquid mass of partly digested food that is expelled by the stomach into the duodenum at the beginning of the small intestine