DIGESTIVEwebctFALL2007extra

DIGESTIVEwebctFALL2007extra - 3. Stomach Rugae: temporary...

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1. Stomach Rugae:  temporary folds in lining  when empty In wall:  smooth muscle oriented in  3 different planes Produces churning movements when  contracting Mixes food with digestive enzymes and  mechanically breaks down food Chemical digestion of proteins  begins
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Inner surface of stomach contains   pits Gastric glands   open into base of pits.     LUMEN GLAND PIT SURFACE
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Cells: Mucous Cells   Mucus    Chief Cells     Pepsinogen                   (Inactive Enzyme)   Parietal Cells   HCl In lumen of stomach: Pepsinogen + HCl    Pepsin  (active enzyme) Pepsin mixes with food and begins the  chemical digestion of proteins.
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Very little absorption of food  occurs in stomach  Lipid soluble material ( alcohol ) and  aspirin
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   Chemical digestion of lipids  and nucleic  acids  begins and 
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DIGESTIVEwebctFALL2007extra - 3. Stomach Rugae: temporary...

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