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Download Physical vs. Chemical Changes in Digestion
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DIGESTIVE SYSTEM Mouth Liver Salivary Glands Esophogus Stomach Pancreas Large intestine Small intestine Rectum Anus The Digestive System Purpose: • Break down food into small pieces that cells can use. How is food digested? • Mechanical break down of food into smaller pieces = physical change • Mixing of food • Movement through the digestive tract • Chemical break down of big molecules of food into smaller molecules = chemical change Mouth • Physical (Mechanical) digestion – teeth • Chewing – breaks food into small pieces •Chemical digestion – saliva • Enzymes in the saliva begin digestion of carbohydrates. • Muscular tube Esophagus • Physically moves food to stomach using waves of muscle contractions called peristalsis. Stomach • Produces strong digestive juices. •Chemical Digestion breaks down and dissolves food nutrients. •Digests proteins and fats in the stomach Small Intestine • Enzymes continue the chemical digestion of food. •Nutrients are broken down small enough to go through the VILLI of small intestine, and into blood •Digests proteins, fats, and carbohydrates. Digestion Completed Here Pancreas • Accessory organ •Food does not enter the pancreas •Produces chemicals to help break down macromolecules (big molecules) = chemical difestion Liver • Produces bile to help digest fat = mechanical digestion = physical change • Bile is Stored in the Gallbladder Large Intestine (Colon) • Absorbs dissolved nutrients & water • NO DIGESTION •Forms wastes into solid feces •Physical Change Rectum • Compacts and stores solid waste Anus • Opening through which “feces” = solid waste leaves the body • Voluntary Action Mouth Liver Salivary Glands Esophogus Stomach Pancreas Large intestine Small intestine Rectum Anus
