Phospholipid Degradation and Hormonal Control of Lipid Digestion
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Questions and Answers

What is the main function of Phospholipase A2 in lipid digestion?

  • Prevents the breakdown of phospholipids
  • Adds a fatty acid to a phospholipid
  • Converts a phospholipid into a triglyceride
  • Removes one fatty acid from carbon 2 of a phospholipid (correct)

    • Which hormone stimulates the gallbladder to contract and release bile during lipid digestion?

  • Secretin
  • Glucagon
  • Insulin
  • Cholecystokinin (CCK) (correct)

    • Which component is NOT typically found in bile?

  • Bile salts
  • Free cholesterol
  • Phospholipids
  • Amylase (correct)

    • What is the primary function of CCK hormone in lipid digestion?

    <p>Stimulate the release of digestive enzymes from the pancreas</p> Signup and view all the answers

    Which part of the small intestine primarily produces cholecystokinin (CCK)?

    <p>Lower duodenum and jejunum</p> Signup and view all the answers

    What is the main role of secretin in lipid digestion?

    <p>Stimulate the pancreas and liver to release bicarbonate</p> Signup and view all the answers

    What is the main role of lingual and gastric lipases in patients with a near or complete absence of pancreatic lipase?

    <p>Break down TAG molecules</p> Signup and view all the answers

    Why is emulsification necessary for the digestion of fats?

    <p>To enhance enzyme access by increasing surface area</p> Signup and view all the answers

    Which two mechanisms are responsible for emulsification in the small intestine?

    <p>Bile Salts and Peristalsis</p> Signup and view all the answers

    What is the primary function of bile salts in the emulsification process?

    <p>Increase the surface area of lipid droplets</p> Signup and view all the answers

    What role does peristalsis play in digestion?

    <p>Move food along the digestive tract</p> Signup and view all the answers

    Which type of enzymes are responsible for degrading dietary TAG, cholesteryl esters, and phospholipids?

    <p>Pancreatic Enzymes</p> Signup and view all the answers

    What is the primary role of pancreatic lipase in lipid degradation?

    <p>Breaking down TAG molecules into monoacylglycerol and free fatty acids</p> Signup and view all the answers

    Why is colipase essential for the activity of pancreatic lipase in lipid digestion?

    <p>It binds and anchors lipase at the lipid-aqueous interface.</p> Signup and view all the answers

    Which enzyme is responsible for hydrolyzing cholesteryl esters during lipid degradation?

    <p>Cholesteryl ester hydrolase</p> Signup and view all the answers

    What is the function of bile salts in lipid digestion?

    <p>Enhancing cholesteryl ester degradation</p> Signup and view all the answers

    How does Orlistat, an antiobesity drug, affect fat absorption in the body?

    <p>Inhibits gastric and pancreatic lipases</p> Signup and view all the answers

    What role does trypsin play in lipid digestion?

    <p>Activating procolipase to colipase</p> Signup and view all the answers

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