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Steps in Digestion 1. Ingestion: - Food is prepped for digestion (chew it, add water and enzymes). - Peristalsis begins: 1. Ingestion muscles contract to move Food food along. particles 2. Digestion: 2. Digestion - Physical digestion (chemical increases surface area of breakdown) food. Nutrient - Chemical digestion uses molecules enzymes to break down complex macromolecules 3. Absorption 3. Absorption Enters - Nutrients (sugar, amino cells acids, nucleic acids, fatty acids) move out of 4. Egestion digestive system into circulatory system. Wastes Returned 4. Egestion to Environment - Waste is removed. Food brought in from environment The Organs of the Digestive System Organs Mouth Esophagus Stomach Liver, gall bladder Pancreas Small Intestine Large Intestine Does Food Pass Through It? What step(s) of digestion does it help with? (Ingestion, Digestion, Absorption, and/or Egestion) How does it help in digestion?