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Mechanical digestion begins in the mouth as the food is chewed Chemical digestion begins in the mouth when food mixes with saliva Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates The epiglottis is a flexible flap at the end of the larynx in the throat. It acts as a switch between the larynx and the esophagus to permit air to enter the airway to the lungs and food to pass into the esophagus esophagus it is a muscular tube connecting the throat with the stomach. The esophagus is about 8 inches long. The esophagus muscle acts with peristaltic action to move swallowed food down to the stomach The food then enters the stomach which is a rounded, hollow j shape organ Located between the esophagus and the duodenum the stomach has three mechanical tasks to do First, the stomach must store the swallowed food and liquid This requires the muscle of the upper part of the stomach to relax and accept large volumes of swallowed material The inner layer of the stomach is