Digestion in… …the small & large intestines 9.5. Small Intestine about 2.5 cm in diameter up to 7 m in length duodenum: first 25- 30 cm: digestion jejenum:

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Presentation transcript:

Digestion in… …the small & large intestines 9.5

Small Intestine about 2.5 cm in diameter up to 7 m in length duodenum: first cm: digestion jejenum: digestion/ absorption ileum: absorption

Pancreas

Carbohydrate Digestion pancreatic amylase is released into duodenum continues breakdown of starch started in the saliva

Pancreatic Secretions fat enters duodenum cholecystokinin (CCK) is released into blood by cells in duodenum CCK causes pancreatic cells to release various substances

pH of Small Intestine chyme has pH of about 2.5 converts prosecretin into secretin, which causes pancreas to release bicarbonate ions (increasing pH to 9.0) pepsin is inactivated, protecting the small intestine

Protein Digestion trypsinogen released by pancreas activated to trypsin by enzyme enterokinase trypsin continues to break down proteins into amino acids

Lipid Digestion bile is produced in liver & stored in gall bladder and released into the duodenum bile breaks down large fat globules lipases secreted by pancreas breat down fats into smaller molecules

Small Intestine - Absorption

Absorption passive transport (including osmosis) facilitated diffusion active transport nutrients are absorbed in capillary networks

Large Intestine up to 7.6 cm in diameter about 1.5 m in length

Large Intestine most of the water is absorbed 500+ species of bacteria produce essential vitamins K and some B. feces are egested through the anus

Animations… Digestion review & quiz: hill.com/sites/ /student_view 0/chapter26/animation__organs_of_dig estion.htmlhttp://highered.mcgraw- hill.com/sites/ /student_view 0/chapter26/animation__organs_of_dig estion.html

Let’s review…

Review… Quizzes: mlhttp://kidshealth.org/kid/htbw/DSquiz.ht ml nce/digestive_system/quiz751.htmlhttp:// nce/digestive_system/quiz751.html

And finally…science meets art