The common term for the protective mucous secretion of the stomach is gastric mucus. It plays a critical role in safeguarding the stomach lining from the harsh acidic environment created by gastric juices, which are essential for digestion. Gastric mucus also aids in the smooth movement of food within the stomach and helps facilitate the healing of any minor injuries in the stomach lining. Without this protective barrier, the stomach would be susceptible to damage, leading to possible conditions like ulcers.