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What body system has the function of breaking down food for absorption into the blood? • What are some ways a cracker can be broken down by the body in order for its nutrition to be absorbed into the body? • Brainstorm ideas on sheet of notebook paper. Cracker Lab • 1. Each student takes 1/4 saltine cracker and places in in the tongue in the mouth. • 2. Students record their observations after 30 seconds. • 3. Each student takes 1/2 cracker and chews then records their observations after 30 seconds. • After reading p. 484, students classify which activity provided evidence for physical and chemical change. Physical: teeth grind food into smaller pieces Chemical: Saliva breaks down food into mush • 5. After reading p. 484, students then swallow the cracker and records observations after 30 seconds and classified that evidence of digestion in the esophagus • 6. Confirm peristalsis- the contraction and relaxation of muscles of the esophagus moving food down to the stomach- with demonstration of a ball squeezed down a tube sock. • Record what you observed. • After reading p. 485-487, students classify the type of changes in the stomach, small intestine and large intestine. Digestive system process where food is broken down through chewing, mixing and churning. Muscles in the stomach grind food into smaller pieces Gastric juice and hydrochloric acid made in stomach break apart large protein molecules Peristalsis slows down Muscles in the rectum release the semisolid waste from the body Excess water is absorbed from the chyme Peristalsis continues to move and mix the chyme Where most chemical digestion occurs: bile breaks down fat particles. Carbohydrates, proteins, and fats are broken down from bile. • Students create a Venn diagram to compare and contrast the evidence of physical and chemical changes in the digestive system