Enzymes involved in digesting starch, proteins and fats are listed. The sources of these enzymes are identified on an animated model of a human body. The adaptations of the small intestine are described, including musculature for peristalsis and villi for absorption. The film finishes with an overview of digestion.

First broadcast:
21 November 2008

Students should describe the 'journey of a ham and cheese sandwich' from mouth to anus. This can be done in as much or as little detail as required. Students can do this in a variety of ways including stories, cartoon strips or poems. At each point in the journey they should say what is happening to fat (cheese), protein (ham) and carbohydrate (bread). What enzymes are produced and what do they break these substances into?