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Regulation of Digestion

26 Jan. 2010. Digestion_Reg.ppt. 2. Chemical Digestion. Depends on enzymes (hydrolytic)Enzyme activity depends onPresence of substrateConcentration of substrateConcentration of enzymeTemperaturepHPepsin @ pH = 2.0Trypsin @ pH = 7.2. 26 Jan. 2010. Digestion_Reg.ppt. 3. Chemical Digestion. Enz

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Regulation of Digestion

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    1. 26 Jan. 2010 Digestion_Reg.ppt 1 Regulation of Digestion

    2. 26 Jan. 2010 Digestion_Reg.ppt 2 Chemical Digestion Depends on enzymes (hydrolytic) Enzyme activity depends on Presence of substrate Concentration of substrate Concentration of enzyme Temperature pH Pepsin @ pH = 2.0 Trypsin @ pH = 7.2

    3. 26 Jan. 2010 Digestion_Reg.ppt 3 Chemical Digestion Enzymes secreted only when appropriate substrates are present in stomach/duodenum. Digestion takes time Necessary to regulate movement of chyme Controls concentrations of substrates and enzymes Controls pH Pyloric sphincter is key control point.

    4. 26 Jan. 2010 Digestion_Reg.ppt 4 Long & Short Reflexes Stimuli Sight, smell, taste, thought of food Stretch of mucosa Chemical changes in lumen “Long reflexes” through CNS “Short reflexes” by enteric nerve plexus

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