The alimentary canal is a muscular tube about 27 feet long and includes the mouth, pharynx, esophagus, stomach, small intestine and large intestine. The alimentary canal is a remarkably efficient passageway, extracting precious nutrients and discarding unneeded wastes from the body. Salivation releases enzymes that will later assist in the digestión. Saliva moistens the food and begins the actual process of digestion. Food+Saliva=bolus. The tongue forces the food into the back of the mouth or pharynx. The stomach mix the food with gastric juices, creating a mixture called chyme. The chyme moves from the stomach to the small intestine by peristalsis.