This is a disgusting plop-up guide to the digestive system. Include pop-up, life-like tongue, close up on chewing and digestion. How the stomach absorbs nutrients. Published by the Penguin Group.This is a disgusting plop-up guide to the digestive system. Include pop-up, life-like tongue, close up on chewing and digestion. How the stomach absorbs nutrients. Published by the Penguin Group.