The Digestion Process: Ingested food passes down the oesophagus (food pipe) into the stomach. Stomach cells produce mucus which protects the stomach lining from damage from digestive acids and chemicals, produced by the stomach itself. The oesophagus cell linings are more delicate and have little protection from acid. A sphincter (a ring of muscule that contracts to close an opening) called lower esophageal sphincter (LES), is present at the junction […]