BIOL 404-Exam 4-GI 3

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kyleannkelsey
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217171
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BIOL 404-Exam 4-GI 3
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2013-05-01 23:20:07
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BIOL 404 Exam GI
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BIOL 404-Exam 4-GI 3
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  1. What are the two stages of carbohydrate digestion?
    • 1.) Enzymatic digestion of polysaccharides to Di/oligosaccharides
    • 2.) Enzymatic digestion f Di/oligosaccharide to monosaccharides
  2. Starches and Glycogen are what type of carbohydrate?
    Polysaccharides
  3. What are oligosaccharides?
    Branched chains of glucose molecules
  4. What organs secrete Amylase?
    • Salivary glands
    • Pancreas
  5. Is Amylase produced in the salivary glands necessary for carbohydrate digestion?
    No
  6. Amylase produced in the salivary glands is inactivated by what?
    Stomach Acid, HCL
  7. What conditions are optimal for pancreatic Amylase?
    A neutral pH
  8. Where does pancreatic Amylase digestion occur?
    In the lumen of the small intestine
  9. What does Amylase digest?
    Polysaccharides to Disaccharides and Oligosaccharides
  10. What enzyme digests polysaccharides to Di and Oligosaccharides?
    Amylase
  11. Where are the enzymes that digest oligo/disaccharides to monosaccharides located?
    In the membrane of the small intestinal epithelial cells
  12. What are brush border enzymes?
    Enzymes imbedded in the small intestinal epithelial cells
  13. Give examples of Brush border enzymes?
    • Sucrase
    • Lactase
    • Glucoamylase
  14. Sucrase, Glucoamylase and Lactase are all located where?
    The small intestinal epithelial cells
  15. What is the action of sucrase?
    Sucrose to glucose and fructose
  16. What is the action of glucoamylase?
    Glucose oligosaccharides to glucose monomers
  17. What is the action of Lactase?
    breaks down Lactose to Glucose and galactose
  18. Where does the digestion of carbohydrates occur in the small intestine?
    The lumen at the brush border
  19. Where does monosaccharide absorption take place?
    Mostly in the first 20% of the small intestine
  20. How is fructose transported into the epithelial cells?
    Facilitated Diffusion
  21. How are glucose and galactose transported into the epithelial cells?
    Secondary active transport coupled with Sodium
  22. How are monosaccharides transported out of epithelial cells?
    Facilitated diffusion into the basolateral membrane
  23. Carbohydrate absorption of what is via Facilitated diffusion?
    Fructose
  24. Carbohydrate absorption of what is via Secondary Active transport coupled with Na?
    Glucose and galactose
  25. What is the SGLT 1 transporter?
    A glucose/galactose secondary active transporter coupled with Na
  26. What is the name of the Na coupled Secondary active transporter that carries Glucose and galactose into the enterocyte?
    SGLT 1
  27. What is the GLUT 2 carrier?
    The facilitated carrier that transports all monosaccharide's out of the enterocyte and into the Villi
  28. What is the facilitated carrier that transports all monosaccharides out of the enterocytes?
    GLUT 2
  29. What is the facilitated carrier for fructose into the enterocyte called?
    GLUT 5
  30. What is GLUT 5?
    The facilitated carrier that moved fructose from the intestinal lumen to the inside of the enterocyte
  31. Energy for SGLT 1 is derived from what?
    Na/K ATPase at the basolateral membrane
  32. The Na/K ATPase at the basolateral membrane derives energy for the transport of what monosaccharide?
    Glucose and Galactose

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