Physicians and surgeons have demanding education and training requirements. Almost all physicians complete at least 4 years of undergraduate school, 4 years of medical school, and, depending on their specialty, 3 to 8 years in internship and residency programs.lmost all physicians complete at least 4 years of undergraduate school, 4 years of medical school, and, depending on their specialty, 3 to 8 years in internship and residency programs.
The throat and esophagus. As seen in the picture, the mouth is connected to the stomach through the throat and the esophagus.
1 The mouth and teeth break food down into manageable pieces and mixes these with saliva, which starts the digestive process.  The oesophagus is the conduit between the mouth and the stomach. Swallowing initiates powerful muscular contractions that push food down into the stomach.