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Digestion PowerPoint Presentation

Digestion

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Digestion

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  1. Digestion • Breakdown of large food molecules into simpler usable forms • Physical digestion- • physical changes, biting, chewing, grinding, mixing • Chemical digestion- • chemical changes, enzymes act on food, enzyme specific to food it acts on

  2. Digestion • 3 processes • Ingestion- take in food • Digestion/absorption- breakdown, food enters bloodstream • Egestion- elimination of solid wastes

  3. Human Digestion Time-Line

  4. Human Digestion Diagrams • Diagram B- Mouth, Salivary Glands, & Pharynx • Mouth- • Ingests food, • Physical digestion (teeth) • Chemical digestion (saliva) • 1. Sublingual gland- saliva • 2. Submandibular gland- saliva • 3. Parotid gland- saliva • Pharynx- • Throat- food & air passage

  5. Human Digestion Diagrams • Diagram C. Peristalsis • Series of muscular contractions that move food through the digestive tract

  6. Human Digestion Diagrams • Diagram A- Digestive Tract & Associated Organs • 1. Esophagus- • carries food from the mouth/pharynx to the stomach • Cardiac Sphincter- • valve between esophagus and stomach, keeps food in stomach

  7. Human Digestion Diagrams • Diagram A- Digestive Tract & Associated Organs • 2. Stomach- • muscular organ • mixes food, water & hydrochloric acid • produces chyme (acidic liquid paste-like food)

  8. Human Digestion Diagrams • Diagram D- Stomach Lining With Gastric Glands • Release the hydrochloric acid and water that is mixed with food

  9. Human Digestion Diagrams • Diagram A- Digestive Tract & Associated Organs • 3. Pyloric Sphincter- • valve between the stomach and small intestine • 4. Liver- • produces bile • 5. Gall Bladder- • stores bile • empties into the small intestine through the common bile duct

  10. Human Digestion Diagrams • Diagram A- Digestive Tract & Associated Organs • 6. Pancreas- • produces many enzymes that are emptied into the small intestine through the common bile duct

  11. Human Digestion Diagrams • Diagram A- Digestive Tract & Associated Organs • 7. Small Intestine- • longest section of the digestive tract • small diameter • most chemical digestion • absorbs nutrients into the blood stream • Appendix

  12. Human Digestion Diagrams • Diagram E- Small Intestine Lining with Villi- • absorbs the digested food molecules • Villus- • small fingerlike projection • increase surface area • contain blood vessels (capillaries) and a lacteal

  13. Human Digestion Diagrams • Diagram A- Digestive Tract & Associated Organs • 8. Large Intestine- colon • large diameter, absorbs water from the digested wastes, 3 segments (ascending, transverse, and descending colon) • 9. Rectum- • storage of solid wastes, eliminated through anus

  14. Human Digestion