Mouth: You use the mouth to chew the food and get it into small enough pieces in preparation for the digestive system. The mouth is used during the first stage of the digestive system.
Throat: The throat is like the pavement for the food. It leads from the mouth to the top and bottom of the stomach. The food going through the throat is the second stage in the digestive system.
Esophagus: The esophagus connects the throat to the stomach. It is 8 inches or 20 centimeters in length. The food travelling through the digestive system is the third stage in the digestive system.