Cassie M. Lawton 
Human Digestive System [PDF ebook] 

The digestive system helps humans get the most out of every meal and drink. It also rids the body of unwanted substances. This close examination explains the ins and outs of the digestive system, including its location within the human body, the organs used in digestion, and ways excreting certain materials benefits the human body. Its colorful photographs, diagrams, fact boxes, and sidebars keep readers interested and offer comprehensive insight into one of the most important systems of the human body. Discussion questions are included to strengthen readers’ understanding of this life science learning experience.