Digestive System
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Digestive System

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Digestive System Presentation Transcript

  • 1. The Digestive System
    • A Study Guide
    • Ms. Bennett’s Living Environment
  • 2. The purpose of the Digestive System
    • To make big things into small things
  • 3. The Parts of the Digestive System
  • 4. The Mouth
    • Teeth grind food into swallowable substance (bolus)
    • Mechanical and chemical digestion take place here
    • Enzymes in saliva start to break down starches.
  • 5. Esophagus
    • Muscular contractions move the bolus to the stomach
    • These contractions are called peristalsis
    • No new digestion occurs
  • 6. Stomach
    • Stomach is very muscular and churns the food into a paste (chyme).
    • Stomach makes acid which helps break down proteins.
  • 7. Small Intestine
    • No new mechanical digestion takes place
    • Enzymes break down proteins, starches, and fats
    • Nutrients are absorbed into the bloodstream via the villi.
  • 8. Large Intestine
    • Undigested food (now called feces) passes into the large intestine.
    • Water, minerals, and vitamins are reabsorbed.
  • 9. Anus/Rectum
    • The rectum stores feces until it is ready to be released.
    • The anus is the opening through which feces is released.
  • 10. Types of Digestion Part Mechanical Chemical Mouth Chewing Enzymes from saliva Esophagus None None (still continuing from mouth) Stomach Churning of Food Acid from gastric juice Small Intestine None Enzymes Large Intestine None Reabsorption of water and minerals
  • 11. Enzymes
    • Enzymes are chemicals that speed up chemical reactions.
    • Enzymes used in digestion help break big things into small things.
    • 3 types of enzymes
      • Proteases - act on proteins
      • Amylases - act on starch
      • Lipases - act on fats