Lipid Digestion and Absorption Quiz
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Questions and Answers

Where does absorption of ascorbic acid (Vitamin C) primarily occur?

  • Entire small intestine (correct)
  • Entire large intestine
  • Rectum
  • Stomach
  • Which vitamin is primarily absorbed through receptor-mediated endocytosis in the distal ileum?

  • Vitamin B12 (correct)
  • Vitamin B5
  • Vitamin B9
  • Vitamin B6
  • How is niacin (Vitamin B3) primarily absorbed in the small intestine?

  • Carrier-mediated (correct)
  • SVCT transport mechanism
  • Receptor-mediated endocytosis
  • Diffusion
  • What is the mechanism of absorption for biotin (Vitamin B7) in the intestines?

    <p>Carrier-mediated</p> Signup and view all the answers

    In which part of the GI tract do muscle cells act as a conveyor belt to move contents in the proper direction?

    <p>Small intestine</p> Signup and view all the answers

    What happens to iron absorption when less iron binds to ferritin?

    <p>Iron absorption increases</p> Signup and view all the answers

    Which region of the intestine is the most permeable in terms of paracellular permeability?

    <p>Duodenum</p> Signup and view all the answers

    What is the main reason for the flow of fluids mainly from blood to lumen in the small intestine?

    <p>High osmotic pressure in the lumen</p> Signup and view all the answers

    Which lipoprotein is formed as a result of lipid digestion and reprocessing within enterocytes?

    <p>Chylomicrons</p> Signup and view all the answers

    What role does bile play in the digestion of dietary fats?

    <p>Emulsifying dietary fats</p> Signup and view all the answers

    In which layer do lipids cross before entering the cytosol during the process of lipid absorption?

    <p>Unstirred layer</p> Signup and view all the answers

    Which ion is more abundantly transported in distal regions of the intestine?

    <p>Sodium (Na+)</p> Signup and view all the answers

    What is the primary role of lipase and colipase in lipid digestion?

    <p>To break down lipids into fatty acids and monoglycerides</p> Signup and view all the answers

    What is the function of cholesterol esterase in lipid digestion?

    <p>To break down cholesterol esters into cholesterol and fatty acids</p> Signup and view all the answers

    What is the primary function of micelles in lipid absorption?

    <p>To transport lipids across the unstirred layer and into the intestinal epithelial cells</p> Signup and view all the answers

    What is the role of fatty acid binding proteins (FABP) in the cytosolic reprocessing of lipids?

    <p>To bind and transport fatty acids to the smooth endoplasmic reticulum for re-esterification</p> Signup and view all the answers

    What is the final step in the absorption of lipids across the intestinal epithelium?

    <p>The exocytosis of chylomicrons across the basolateral membrane</p> Signup and view all the answers

    What is the role of phospholipase A-2 in lipid digestion?

    <p>To produce fatty acids and lyosphosphatides from phospholipids</p> Signup and view all the answers

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