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Urinary and Digestive System Essay Preview: Urinary and Digestive System Report this essay CH. 16 Digestive and Urinary System Lesson 1: The Digestive System Terms: Digestion: Absorption: Elimination: Mastication: Peristalsis: Gastric Juices: Bile: Functions of the Digestive System: Digestion, Absorption, and Elimination. Digestion occurs in the digestive tract which includes: Mouth: Mastication occurs and enzymes.