Closswork 06 March 2005 Digestive systam 1. Name the main processes that take place in the digestive syetim. 2. Stote how chemical digestion teke ploce end give oxcomples of where it happens. \( - \) 23. Explain what mechanical digestion is 4. In your own words exaplan what poristalsis is is

**Digestive System Overview** 1. **Main Processes:** - **Ingestion:** Taking in food and liquids. - **Mechanical Digestion:** Breaking food into smaller pieces (e.g., chewing). - **Chemical Digestion:** Breaking down food into simpler molecules using enzymes and acids. - **Absorption:** Taking nutrients into the bloodstream. - **Defecation:** Removing waste from the body. 2. **Chemical Digestion:** - Occurs in the mouth, stomach, and small intestine. - Enzymes like amylase in saliva, pepsin in stomach, and pancreatic enzymes in the small intestine break down carbohydrates, proteins, and fats. 3. **Mechanical Digestion:** - Physical breakdown of food into smaller pieces. - Involves chewing in the mouth and churning in the stomach. 4. **Peristalsis:** - Wave-like muscle contractions that move food through the digestive tract. - Helps in the movement of food and waste from the esophagus to the intestines. In summary, the digestive system uses both mechanical and chemical processes to break down food and absorb nutrients, with peristalsis facilitating the movement of food through the tract.