ASGE | Quick Anatomy Lesson: Human Digestive System - Digestion in adults
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Hum Biol. Oct;69(5) Phylogenetic analysis of the evolution of lactose digestion in adults. Holden C(1), Mace R. Author information: (1)Department. The digestive system -- which can be up to 30 feet in length in adults -- is usually divided into eight parts: the mouth, the esophagus, the stomach, the small.