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Digestive system overview

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  • 1. Construct your Interactive Notes• Staple 7 pages of binder paper to cover• On cover: – Chapter 16: Digestive System – Name, Period – Color drawing• Number the pages
  • 2. Notes: Overview of Digestive System (pg 2)
  • 3. Notes: Overview of Digestive System (pg 2)• Includes digestive tract and accessory organs
  • 4. Notes: Overview of Digestive System (pg 2)• Includes digestive tract and accessory organs• Functions: break down food, absorb nutrients, eliminate waste
  • 5. Digestive Tract• Also called the alimentary canal or gastrointestinal (GI) tract
  • 6. Digestive Tract• Also called the alimentary canal or gastrointestinal (GI) tract• Long continuous tube (9 meters) that extends from mouth to anus
  • 7. Digestive Tract• Also called the alimentary canal or gastrointestinal (GI) tract• Long continuous tube (9 meters) that extends from mouth to anus• Includes mouth, pharynx, esophagus, stomach, small intestine and large intestine
  • 8. Accessory structures• Tongue and teeth• Function: mastication (chewing)
  • 9. Accessory Organs• Salivary glands, liver, gallbladder, and pancreas
  • 10. Accessory Organs• Salivary glands, liver, gallbladder, and pancreas• Function: secrete fluids into digestive tract
  • 11. Digestive System Activities1. Ingestion: Taking in food
  • 12. Digestive System Activities1. Ingestion: Taking in food2. Mechanical digestion: large pieces of food are broken into smaller pieces through chewing and stomach churning
  • 13. Digestive System Activities1. Ingestion: Taking in food2. Mechanical digestion: large pieces of food are broken into smaller pieces through chewing and stomach churning3. Chemical digestion: Complex molecules of carbohydrates, proteins, and fats are transformed into smaller molecules that can be absorbed. Hydrolysis uses water to chemically break molecules apart. Digestive enzymes speed up the process of hydrolysis
  • 14. Digestive System Activities4. Movements: First movement is swallowing (deglutition). Then mixing movements in the stomach. Peristalsis = rhythmic contractions that move food particles through the digestive tract.
  • 15. Digestive System Activities4. Movements: First movement is swallowing (deglutition). Then mixing movements in the stomach. Peristalsis = rhythmic contractions that move food particles through the digestive tract.5. Absorption: Simple molecules pass through cells lining the small intestine and enter the blood or lymph capillaries
  • 16. Digestive System Activities4. Movements: First movement is swallowing (deglutition). Then mixing movements in the stomach. Peristalsis = rhythmic contractions that move food particles through the digestive tract.5. Absorption: Simple molecules pass through cells lining the small intestine and enter the blood or lymph capillaries6. Elimination: Food molecules that cannot be digested are eliminated through defecation
  • 17. Output (pg 3)• Paste in diagram “Organs of the Digestive System”• We will label it as a class