Processing of food by the ds 1. Ingestion: process of eating 2. Propulsion: passing of food down the gi tract swallowing: voluntary peristalsis: reflex, involuntary, involves alternating contractions of muscles in body walls of Gi organs 3. Mechanical digestion prepares food for chemical digestion includes chewing, mixing with saliva by tongue action, churning in stomach9 1. Ingestion : process of eating 2. Propulsion : passing of food down the GI tract • swallowing : voluntary • peristalsis : reflex, involuntary, involves alternating contractions of muscles in body walls of GI organs 3. Mechanical digestion • prepares food for chemical digestion • includes chewing, mixing with saliva by tongue action, churning in stomach... Processing of food by the DS