What is the substance called that leaves the stomach and consists of all the eaten foods combined with stomach acids?

The substance that leaves the stomach and consists of all the eaten foods combined with stomach acids is called chyme. Chyme is a semi-liquid mixture that occurs after food has been partially digested by the stomach's gastric juices, which include hydrochloric acid and various digestive enzymes.

This process allows the food to be broken down into a form that can be easily processed in the small intestine, where nutrient absorption occurs. The next step in digestion involves chyme moving into the duodenum, the first part of the small intestine, where it is met with bile and pancreatic juices to continue the digestive process.

The other terms do not accurately describe this mixture. Gastric acid refers specifically to the hydrochloric acid and digestive enzymes present in the stomach but does not encompass the solid and liquid food components. Digestive juice is a broader term that can refer to any fluid aiding in digestion, but it isn't specific to the mixture leaving the stomach. Bolus refers to the mass of food that has been chewed and formed in the mouth, ready for swallowing, but it hasn't yet been combined with stomach acids. Thus, chyme is the most accurate term for this stage of digestion.