Email me if you have any questions . If you know the function of it, then you know the exact purpose of the esophagus and stomach and small intestine etc: mechanical and chemical events, functions of the digestive system (there should be six) We will be starting with the difference between chemical and mechanical events int the digestive system: The stomach contains a low ph to assist with further breakdown. Mouth: the teeth grind the food down and the tongue assists with turning the food into a bolus. Stomach: the stomach contains a thick layer of muscle and it is so it can churn the food into chyme which has the consistency of watery baby food. Small intestine: beak down of fats because of the bile that is released from the liver. Small intestine: the small intestine does not physically churn or grind food.