Chapter 23 - Gastrointestinal tract lectures Raja Fayad, MD...

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Gastrointestinal tract lectures Raja Fayad, MD [email protected] Office: (803) 777-2918 Room: 305B
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GI lecture series 3 lectures Exam: multiple choice, short-answer questions, and true/false.
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G.I. Tract Learning objectives 1. De s c ribe  diffe re nc e s  in the  ba s ic  s truc ture  o f the  a lim e ntary c ana l wall alo ng  the   le ng th o f the  c anal o r within individual o rg ans . 2. Unde rs tand the  m a in func tio ns  and fe a ture s  o f e ac h o rg a n in the  G I tra c t. 3. Unde rs tand what dig e s tive  pro c e s s e s  o c c ur a lo ng  the  a lim e nta ry c a nal. 4. Unde rs tand ho w s pe c ific  c e ll type s , s e c re te d pro duc ts  o r s pe c ia lize d s truc ture s   c o ntribute  to  dig e s tio n. 5. Unde rs tand the  c o ntrib utio ns  o f a c c e s s o ry o rg a ns  to  the  dig e s tive  pro c e s s .  6. C o m pa re /c o ntras t the  dig e s tive  pro c e s s e s  o f c a rbo hydrate s , pro te ins  and fa ts 7. Kno w the  m e c hanis m s  re g ula ting  s to m ac h s e c re tio ns 8. Kno w the  m e c hanis m s  re g ula ting  s m all inte s tine , live r, and  pa nc re a s   s e c re tio ns .
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Digestive System Outline A. Overview of digestive system structure/function. B. Functional anatomy of the Digestive system. C. Mechanics of Digestion D. Control of Digestion  
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Anatomy m o uth e s o pha g us s to m a c h s m a ll inte s tine la rg e  inte s tine
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Digestion 1) Ing e s tio n 2) P ro puls io n 3) Me c ha nic a l Dig e s tio n 4) C he m ic a l Dig e s tio n 5) Ab s o rptio n 6) De fe c a tio n  
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Mouth Functions / Structures stratified squamous epithelium  keratinized Gums hard palate dorsum of tongue defensins secreted  lips and cheeks    hard palate: a rigid surface against  which the tongue forces food during  chewing  soft palate:  mostly skeletal muscle,  containing uvula blocking nasopharynx
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Tongue Functions / Structures occupies the floor of the mouth composed of mainly of skeletal muscle fibers mixes food with saliva to form a “bolus”  , and initiates  swallowing
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Salivary Glands: Functions / Structures   Extrinsic and intrinsic salivary glands secrete saliva   parotid (mumps) submandibular sublingual glands  Composed of 2 types of secretary cells 1) serous cells (in all 3 glands) 2) mucous cells (not in parotid glands)
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S a liva  func tio ns   c le a ns e  m o uth   dissolve food chemicals for taste   moistens food and aids in “bolus” formation   contains enzymes to breakdown starch    Composition of saliva   99% H2O  salivary amylase  mucin Control of salivation    parasympathetic control by autonomic nervous system
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This note was uploaded on 01/10/2012 for the course EXSC 224 taught by Professor Thomson during the Fall '07 term at South Carolina.

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Chapter 23 - Gastrointestinal tract lectures Raja Fayad, MD...

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