The human digestive system is a complex series of organs and glands that processes food. In order to use the food we eat, our body has to break the food down into smaller molecules that it can process; it also has to excrete waste.
Most of the digestive organs (like the stomach and intestines) are tube-like and contain the food as it makes its way through the body. The digestive system is essentially a long, twisting tube that runs from the mouth to the anus, plus a few other organs (like the liver and pancreas) that produce or store digestive chemicals.
When you are teaching kids about the digestive system it should be fun that way they will always remember how their digestive system works.It is to read from a book but they have more fun with hands on experiments also kids love playing games ,and watching the videos so I have put together a collection
http://www.enchantedlearning.com/subjects/anatomy/digestive/ THIS SITE CONTAINS THE FULL INFORMATION AND WILL PRINT HUMAN DIGESTIVE SYSTEM WORKSHEETS
Science Heroes 1: The Digestive System for Kids THIS GAME IS FOR THE IPHONE
http://www.anatomyarcade.com/games/gamesDigestive.html games crosswords,puzzles extc
http://nature.ca/discover/exm/blddgstvsystm/index_e.cfm Build your Digestive System
http://www.homeschoolroom.com/digestive-system-demonstration/ Experiment Demonstration
http://www.coreknowledge.org/mimik/mimik_uploads/lesson_plans/517/Digestion%20%20The%20Fascinating%20Journey%20from%20Start%20to%20Finish.pdf PDF FILE
http://www.parents.com/blogs/homeschool-den/2013/05/06/science/digestive-system-hands-on-activities-esophagus-stomach-small-intestines/ Hands on Activities
http://www.teacherplanet.com/resource/digestive.php Lesson Plans WorkSheets