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Food Digestion

Food Digestion. So what happens to that Quarter Pounder with Cheese, Large Fries and Chocolate Milk Shake. Understanding Digestive Enzymes. Digestion is the breakdown and absorption of food ABSORPTION ONLY TAKES PLACE IN THE SMALL INTESTINE. Protease & Peptidase Lipases Carbohydrase.

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Food Digestion

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  1. Food Digestion So what happens to that Quarter Pounder with Cheese, Large Fries and Chocolate Milk Shake

  2. Understanding Digestive Enzymes Digestion is the breakdown and absorption of food ABSORPTION ONLY TAKES PLACE IN THE SMALL INTESTINE

  3. Protease & Peptidase Lipases Carbohydrase Break proteins into amino acids Split fat into 3 fatty acids Split carbs into smaller sugars - Glucose Classified by their Substrates

  4. Oral Cavity Stomach Duodenum Jejunum Digestion occurs at the • Teeth • Peristalsis • Villi • Villi • Tongue • Acids • Enzymes • Enzymes • Saliva • Enzymes • Neutralizers

  5. Digestive Enzymes are produced • Salivary Glands • Stomach • Pancreas • Small Intestine

  6. Mechanical Mastication End Product Ground Food Teeth • Chemical • None • Affects • None

  7. Mechanical Moves food back and forth End Product Bolus Tongue • Chemical • None • Affects • None

  8. Mechanical Helps to shape bolus End Product Round Bolus Hard Palate • Chemical • None • Affects • None

  9. Mechanical Moistens End Product Moist Bolus Salivary Glands • Chemical • Amylase • Affects • Polysaccharides • Starches

  10. Mechanical End Product Pharynx No Mechanical or Chemical change to Food. Pushes Food Via Peristalsis Chemical Affects

  11. Mechanical End Product Esophagus No Mechanical or Chemical change to Food. Pushes Food Via Peristalsis Chemical Affects

  12. Mechanical Churns via Peristalsis Three Muscles End Product Chyme Stomach • Chemical • Pepsin • Gelatinase • Gastric Amylase • Gastric Lipase • Rennin • HCl • Gastrin • Affects • Protein • Breaks down Muscle Collagen • Breaks down Butter Fats • Milk Fats • Milk Proteins • Activates Enzymes/Breaksup Lg Food • Stimulates more HCl Production

  13. Mechanical None End Product Still Chyme Liver • Chemical • Bile • Affects • Emmulsifies Fat

  14. Mechanical None Bile does the Breakdown End Product Still Chyme Gall Bladder Chemical Stores Bile CCK • Affects • Released with Lg Fat quantities • Stimulates Gall Bladder to Void NOTE: Bile Released INTO the Duodenum!

  15. Mechanical None End Product Chyme Pancreas • Chemical • Bicarbonates • Trypsin • Chymotrypsin • Pancreatic Amylase • Steapsin • Insulin • Secretin Affects Neutralizes Stomach Acids Proteins Proteins Polysaccharides Fats Regulates Blood Glucose Stimulates NaCO2 Production NOTE: Pancreatic Juices Released INTO the Duodenum!

  16. Mechanical Pushes Chyme Along Peristalsis Water Absorption End Product Chyme NutrientAbsorption Small Intestine • Chemical • Pepidase • Lactase • Sucrase • Amylase • Affects • Proteins • Milk Fats • Sugars • Polysaccharides NOTE: SI Enzymes found in Jejunum!

  17. Mechanical Absorbs Water Absorbs Salts End Product Feces Large Intestine Chemical Affects • Bacterial Action to Break down some Cellulose • Bacterial Action to regulate fluidity of Feces • Water Absorption Regulation: Diarrhea vs Constipation

  18. Production All the enzymes are produces by the Stomach End Product Pepsin HCl Gastric Juices • Actions • HCl Converts Pepsinogen into Pepsin • Pepsinogen is stimulated by Gastrin • Gastrin is stimulated by Smell, Sight, Taste Thinking

  19. Production All the enzymes are produces by the Pancreas Pancreatic Juices • Actions • Secretin important to stimulate NaCO2 production to neutralize the Strong Stomach Acids • Prevents burning away of Duodenum

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