Answer
1, The mouth, pharynx, esophagus, stomach, small intestine and large intestine are usually considered proper, primary parts of the GI tract. Other structure help in the process of digestion, absorption and movement of food, but are regarded as helping or accessory structures. The structures usually included in this latter (secondary) group are teeth, tongue, salivary glands, the liver, the gall bladder and the pancreas.
Work Step by Step
Mechanical breakdown, swallowing, propulsion, hydrolysis, absorption are the important processes performed by different parts of the digestive tract. These functions are handled mainly by the so- called digestive organs. However, the so-called accessory structures perform functions that are vital and integral to the ingestion, mechanical breakdown, chemical simplification, absorption and elimination (defecation).
