Enzymes are biological catalysts. On page 100, the text usually emphasizes that enzymes are specific (each enzyme only breaks down a certain type of nutrient) and require specific conditions, such as a particular temperature ( ) and acidity level (pH), to function correctly.
: Contains glands that secrete gastric juice and protective mucus. Submucosa : Contains blood vessels and nerves.
The textbook details that the stomach wall consists of four layers:
: How food is physically broken down (chewing) versus chemically transformed (enzymatic reactions). Typical Questions & Answers 1. What are the main functions of the digestive system? Mechanical processing : Grinding and mixing food.