Lab7-1_1 - LAB7 Ex.38 Anatomyofthe DigestiveSystem D...

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LAB 7 Ex. 38 Anatomy of the  Digestive System
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Digestive organs
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Digestive System Function:  supply  nutrients, water  and electrolytes to  the body Mechanical or  Physical Digestion chewing and  churning – no  change in chemical  composition  Chemical Digestion enzymatic  hydrolysis – change  in molecular  structure Nutrient absorption   – nutrients cross  cell membrane and  are distributed to  cells (mostly  happens in small 
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Muscle Layers (Tunics) of GI  tract Mucosa  – innermost layer –  simple columnar   epithelial tissue in most structures,  stratified squamos  in  mouth/pharynx/esophagus (except nasopharyx  –  pseudostratified columnar ) Submucosa  – mid layer – dense connective  tissue Muscularis  – bilayer of smooth muscle  (controls peristalsis) Deep layer – circular muscle Outer layer – longitudinal muscle *except stomach (oblique – circular - longitudinal)  and large intestine Serosa  – outermost layer, visceral  peritoneum – protective function *outside of abdominopelvic cavity this layer is 
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Organs of the Alimentary  Canal Oral Cavity or Mouth stratified squamous epithelium entry point – mechanical and chemical  digestion starts here Pharynx   - starting point of peristalsis  nasopharynx  (pseudostratified col.  epith.) oropharynx  (stratified squamous) laryngopharynx   (stratified squamous)
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This note was uploaded on 02/01/2011 for the course BIOL 228 taught by Professor Marilynkoob during the Fall '10 term at Boise State.

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Lab7-1_1 - LAB7 Ex.38 Anatomyofthe DigestiveSystem D...

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