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

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

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Unformatted text preview: 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 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 Digestion From food Nutrients proteins carbohydrates lipids minerals vitamins water 3 Food is digested into its components (atoms, molecules) which can be used (assimilated and metabolized) by the body 4 Digestion/absorption happens in the GI tract 5 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 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 Recall from Lecture 2 - Vocabulary Transport – The process by which a molecule moves across a barrier (eg. intestinal wall, membrane of cell) 8 9 Basic Biology: What is a Cell? Structure of the Gut Wall 10 Absorption is favored by high surface area created by: 1. folds 2. villi 3. microvilli 11 Analogy to Surface of Small Intestine Rolling foothills = Large circular folds Mountain = Villi Trees on mountain = Microvilli 12 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 Absorption requires transport of...
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This note was uploaded on 01/19/2012 for the course NUTRI SCI 10 taught by Professor Amy during the Spring '08 term at Berkeley.

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

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