key definition

• enamel - hard outer layer of the teeth
• gall bladder - an organ that stores bile and secretes it into duodenum via the bile duct
• hydrochloric acid - a chemical found in gastruc juices that kills harmful microogansims in the food
• hydrochloric acid - provides optimum ph for pepsin activity
• peristalsis - the movement of food down the oesophagus by a wave of muscular contractions
• saliva: fluid secreted by the salivary glands that lubricates the food and causes small pieces to stick together (forms bolus)