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.
A Journey Through the Digestive System. As you chew your food and swallow, the food travels through your esophagus -- which is the passageway that connects your mouth to your stomach. In the stomach, strong acids and enzymes digest, or break down, the food into small particles.