The document discusses the anatomy and functions of the digestive system. It describes the locations and layers of the stomach, as well as the specialized cells that secrete enzymes and acid. It then discusses the small intestine, noting its role in nutrient absorption. The small intestine contains villi and microvilli that increase surface area for absorption. The document next summarizes the large intestine, its role in water absorption and waste elimination, and key structures like the cecum and colon.

1. The Digestive System and Body Metabolism

6. Stomach Anatomy Figure 14.4a

10. Structure of the Stomach Mucosa Figure 14.4b–c

14. Chemical Digestion in the Small Intestine Figure 14.6

20. Large Intestine Figure 14.8