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Awesomeness Awesomeness The Mammalian Digestive System I. Mammalian Digestive System A. This system consists of the alimentary canal and various accessory glands that secrete digestive juices into the canal through ducts. 1. Peristalsis, rhythmic waves of contraction by smooth muscles in the wall of the canal, pushed the food along tract. 2. Sphincters are ring-like.