Lipoprotein Metabolism: Cholesterol and Triglycerides Functions
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Questions and Answers

How do chylomicrons travel through the body?

  • They are taken up by all cells via LDL receptors
  • They travel through the lymph to the body (correct)
  • They circulate in the bloodstream for hours
  • They are absorbed by liver enzymes

    • What is the main function of lipoprotein lipase?

  • To synthesize glycerol in adipose tissue
  • To remove cholesterol from body cells
  • To break down triglycerides in chylomicrons (correct)
  • To form triglycerides in the liver

    • How are remnants of chylomicrons cleared from the body?

  • Via remnant receptors in the liver (correct)
  • By endocytosis in muscle tissues
  • Via LDL receptors in liver
  • By direct excretion through urine

    • What happens to VLDL remnants in the body?

    <p>They are broken down into LDL (D)</p> Signup and view all the answers

    How does cholesterol released from LDL affect endogenous cholesterol production?

    <p>It reduces HMG CoA reductase activity (C)</p> Signup and view all the answers

    What is the main function of ApoA1 protein in relation to HDLs?

    <p>To interact with cell macrophages for cholesterol removal (A)</p> Signup and view all the answers

    What characterizes lipoprotein (a) or Lp(a)?

    <p>It is an independent risk factor for heart disease and stroke (D)</p> Signup and view all the answers

    Which lipoprotein is produced by the liver to send triglycerides to cells for energy during fasting?

    <p>VLDL (D)</p> Signup and view all the answers

    What is the main function of LDL in the context of lipoprotein metabolism?

    <p>Main component in atherosclerosis (A)</p> Signup and view all the answers

    What is the body's main source of immediate and stored energy?

    <p>Triglycerides (A)</p> Signup and view all the answers

    Where are chylomicrons produced, and what do they mainly contain?

    <p>Produced by intestines, contain dietary fats &amp; cholesterol (C)</p> Signup and view all the answers

    What is the specific role of HDL in lipoprotein metabolism?

    <p>Remove excess cholesterol from tissues (D)</p> Signup and view all the answers

    Which lipoprotein is considered the 'good guy' due to its function of removing excess cholesterol from tissues?

    <p>HDL (D)</p> Signup and view all the answers

    What is the main component of atherosclerosis that LDL contributes to?

    <p>Cholesterol (B)</p> Signup and view all the answers

    Which lipoprotein is primarily responsible for carrying triglycerides?

    <p>VLDL (A)</p> Signup and view all the answers

    What happens to chylomicrons as they mature?

    <p>Chylomicrons carry dietary fats and cholesterol. (C)</p> Signup and view all the answers

    What is the primary source of cholesterol synthesis in the body?

    <p>All cells except mature RBCs (B)</p> Signup and view all the answers

    Which type of lipoprotein is involved in transporting cholesterol to all cell membranes?

    <p>LDL (D)</p> Signup and view all the answers

    What is the primary function of triglycerides in the body?

    <p>Serving as an immediate energy source (D)</p> Signup and view all the answers

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