Lecture+3++Digestion+,+part+2

Lecture+3++Digestion+,+part+2 - Digestion is followed by...

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Digestion is followed by Absorption, Transport & Elimination 9/07/11; S.E. Fleming Lecture 3 Recommended reading (same as Lecture 2): Smolin & Grosvenor, Chapter 3. 1
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Lecture Outline Review Overview & basic concepts important for today’s lecture From mouth to stomach Role of stomach Role of small intestine Movement of nutrients to other organs and cells Summary 2
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Digestion From food Nutrients proteins carbohydrates lipids minerals vitamins water 3
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Food is digested into its components (atoms, molecules) which can be used (assimilated and metabolized) by the body 4
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Digestion/absorption happens in the GI tract 5
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Lecture Outline Review Overview & basic concepts important for today’s lecture From mouth to stomach Role of stomach Role of small intestine Movement of nutrients to other organs and cells Summary 6
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The Big Picture 7 Food Components of food Absorbed into body Fermented within lumen of GIT Eliminated in feces Metabolized by various tissues Transport Transport Transport Transport
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Recall from Lecture 2 - Vocabulary Transport – The process by which a molecule moves across a barrier (eg. intestinal wall, membrane of cell) 8
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9 Basic Biology: What is a Cell?
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Structure of the Gut Wall 10
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Absorption is favored by high surface area created by: 1. folds 2. villi 3. microvilli 11
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Analogy to Surface of Small Intestine Rolling foothills = Large circular folds Mountain = Villi Trees on mountain = Microvilli 12
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Absorption analogy Within the mountains (Villi) are pipes (arteries, veins, lymph vessels) that run from ground surface (epithelial cell layer) into the interior of the earth (body) 13
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Absorption requires transport of
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