Ethanol and Phenobarbital Interaction: Effects on Metabolism
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Questions and Answers

What percentage of alcohol is absorbed in the stomach?

  • 40%
  • 30%
  • 20% (correct)
  • 10%
  • Which organ is responsible for metabolizing about 90% of the alcohol in the body?

  • Liver (correct)
  • Pancreas
  • Lungs
  • Kidneys
  • What is the primary toxic compound yielded from alcohol metabolism by colon bacterial ADH?

  • Ethanol
  • Formaldehyde
  • Methanol
  • Acetaldehyde (correct)
  • Which system is important for breaking down large amounts of alcohol?

    <p>Microsomal ethanol-oxidizing system (MEOS)</p> Signup and view all the answers

    What is the main compound that is excreted into the urine after alcohol metabolism?

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

    What represents 1 unit for clinical purposes in terms of pure alcohol content?

    <p>8g</p> Signup and view all the answers

    What is the primary target of peroxidation caused by free radical release in the liver?

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

    What contributes to the transient hyperglycemia observed after ethanol consumption with a meal?

    <p>Inhibition of glycolysis</p> Signup and view all the answers

    What is the consequence of an accumulation of acetaldehyde in the liver after ethanol consumption?

    <p>Diminished secretion of serum proteins</p> Signup and view all the answers

    What contributes to the formation of acetaldehyde adducts in chronic ethanol consumption?

    <p>Covalently binds to proteins and lipids</p> Signup and view all the answers

    What is the consequence of the increased NADH/NAD+ ratio on FA metabolism?

    <p>Inhibition of FA oxidation and accumulation of TAGs in the liver</p> Signup and view all the answers

    How does ethanol-induced hyperlipidemia occur?

    <p>Through the incorporation of TAGs into VLDLs</p> Signup and view all the answers

    What is the result of ethanol metabolism on ketone body production?

    <p>Increased ketone body production</p> Signup and view all the answers

    How does ethanol affect gluconeogenesis in fasting individuals?

    <p>Increases the levels of lactate and alanine for gluconeogenesis</p> Signup and view all the answers

    What happens to OAA levels in the TCA cycle due to ethanol metabolism?

    <p>OAA levels become too low for citrate synthase activity</p> Signup and view all the answers

    How does an increase in lactate affect blood glucose levels during fasting with ethanol consumption?

    <p>It contributes to maintaining blood glucose through gluconeogenesis</p> Signup and view all the answers

    Which enzyme family is primarily responsible for the metabolism of ethanol in the liver?

    <p>Alcohol Dehydrogenase (ADH)</p> Signup and view all the answers

    Which enzyme has a higher affinity for acetaldehyde and is very specific in its action?

    <p>Acetaldehyde Dehydrogenase (ALDH)</p> Signup and view all the answers

    What is the preferred antidote for overdoses of methanol or ethylene glycol?

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

    Which enzyme is responsible for generating toxic acetaldehyde, particularly in the liver?

    <p>Alcohol Dehydrogenase (ADH)</p> Signup and view all the answers

    Individuals with an allelic variant of which enzyme have a greatly decreased capacity for acetaldehyde metabolism?

    <p>Acetaldehyde Dehydrogenase (ALDH)</p> Signup and view all the answers

    Chronic consumption of ethanol can lead to an increase in which enzyme levels by 5-10 fold?

    <p>Cytochrome P450 2E1 (CYP2E1)</p> Signup and view all the answers

    How does disulfiram deter the consumption of alcohol in a chronic alcoholic patient?

    <p>By blocking the conversion of acetaldehyde to acetate which causes the accumulation of acetaldehyde</p> Signup and view all the answers

    What effect does disulfiram have on the metabolism of ethanol in the body?

    <p>It accelerates the metabolism of ethanol to acetate</p> Signup and view all the answers

    What role does the inhibition of ketogenesis play in the mechanism of disulfiram?

    <p>It has no impact on ketone levels in the body</p> Signup and view all the answers

    How does disulfiram affect the balance between NAD and NADH?

    <p>It increases NAD levels while reducing NADH levels</p> Signup and view all the answers

    What is the consequence of activating FAO in the presence of disulfiram?

    <p>Increased lactic acidosis</p> Signup and view all the answers

    Which metabolic process is most affected by disulfiram in a chronic alcoholic?

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

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