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Dr. Jessica Guerrero 9th Edition Human Anatomy & Physiology 2402 Chapter 23 Marieb & Hoehn Happy Wife and Proud Mother of 6! Passionate Educator Professor of Biological Sciences Owner, World Changing Fitness Certified Master Trainer Life Coach and Mentor The digestive system is continually at work, yet people seldom appreciate the complex tasks it performs in a choreographed biologic symphony. Consider what happens when you eat an apple. Of course, you enjoy the apple’s taste as you chew it, but in the hours that follow, unless something goes amiss and you get a stomachache, you don’t notice that your digestive system is working. You may be taking a walk or studying or sleeping, having forgotten all about the apple, but your stomach and intestines are busy digesting it and absorbing its vitamins and other nutrients. By the time any waste material is excreted, the body has appropriated all it can use from the apple. In short, whether you pay attention or not, the organs of the digestive system perform their specific functions, allowing you to use the food you eat to keep you going. This chapter examines the structure and functions of these organs, and explores the mechanics and chemistry of the digestive processes (OpenStax, 2013).