What is digestion? -- Teeth and tongue -- From mouth to stomach -- Peristalsis -- The stomach -- The small intestine -- The pancreas -- Digestion chemicals -- The liver -- Cleaning the blood -- The large intestine -- The kidneys -- The urinary tract -- Food for growth -- Food for energy -- Measuring food energy -- Vitamins and minerals -- A balanced diet -- Food poisoning -- Digestive illnesses -- Healthy digestion.