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PORTAGE LEARNING BIOD 121 Nutrition Exam 2 Specific parts of the GI tract include the mouth, esophagus, (A) , small intestine, (B) and (C) . Other organs such as the liver, gallbladder and pancreas aid in digestion but are not considered part of the GI tract. A. stomach B. large intestine C. rectum Explain the cause and symptoms of heartburn. Heartburn is a burning sensation in the esophagus due to an improper closing of a sphincter that allows stomach acids to enter into the esophagus....