Mouth-Mechanical breakdown~begins chemical digestion of carbohydrates, pharynx-connects mouth w/ esophagus, esophagus- peristalsis pushes food to stomach, stomach-Secrets acid & enzymes~mixes food & secretions to begin enzymatic digestion of proteins, small intestine-mixes food w/bile & pancreatic juices~final enzymatic breakdown of food molecules~Main site of nutrient absorption, large intestine- Absorbs water & electrolytes~form feces, Rectum-regulates elimation of feces.