When food reaches the stomach via the food pipe (esophagus), it gets mixed with the secretions of the gastric glands that are present in the stomach wall. These secretions include hydrochloric acid (HCl), pepsin (digestive enzyme) and mucus among others. The food is partially digested in the stomach. Then the contents of the stomach ie partially digested food mixed with gastric secretions leave the stomach and enter the duodenum (initial part of small intestine). This mixture of food and secretions is called chyme. Views · View Upvotes.