Toxic Metabolites in Drug and Contaminant Metabolism
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Questions and Answers

What is the term for the process where orally administered drugs pass through the liver before entering the systemic circulation?

  • First-pass effect (correct)
  • Extrahepatic metabolism
  • Xenobiotic metabolism
  • Intestinal metabolism
  • Which enzyme found in the liver plays a significant role in the metabolism of drugs that pass through it?

  • CYP3A4 (correct)
  • P-glycoprotein
  • Amylase
  • Acetylcholinesterase
  • In the context of drug metabolism, what does 'bioavailability' refer to?

  • The binding of drug molecules to receptors
  • The fraction of unchanged drug reaching systemic circulation (correct)
  • The rate of drug excretion from the body
  • The concentration of drug at the site of action
  • Which term describes drug metabolism that occurs outside of the liver?

    <p>Intestinal metabolism</p> Signup and view all the answers

    What is one significant consequence of extensive first-pass metabolism for orally administered drugs?

    <p>Decreased oral bioavailability</p> Signup and view all the answers

    Which process can sometimes result in decreased oral bioavailability of certain drugs in humans?

    <p>First-pass effect</p> Signup and view all the answers

    Which of the following is true about the role of intestinal enzymes in drug metabolism?

    <p>Intestinal -glucuronidase enzymes can liberate free drugs for possible reabsorption.</p> Signup and view all the answers

    In extrahepatic drug metabolism, which tissue has some metabolizing capability but carries out more substrate-selective transformations?

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

    Which process involves the reduction of many aromatic azo and nitro drugs by intestinal microbes?

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

    How does the first-pass effect impact drug metabolism?

    <p>It can lead to significant drug metabolism before reaching systemic circulation.</p> Signup and view all the answers

    Which enzyme is particularly important in carrying out hydrolysis of many ester prodrugs in the intestine?

    <p>-Lipase</p> Signup and view all the answers

    Among the listed drugs, which one undergoes significant sulfate conjugation in the intestinal wall after oral administration?

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

    What is the chemically reactive metabolite responsible for liver damage due to bromobenzene administration in rats?

    <p>4-bromobenzene oxide</p> Signup and view all the answers

    Which environmental contaminants can result in the formation of polycyclic aromatic hydrocarbons?

    <p>Refuse burning and industrial processes</p> Signup and view all the answers

    What is the stable epoxide metabolite of the anticonvulsant drug carbamazepine, which contributes to its therapeutic effect?

    <p>Carbamazepine-10,11-epoxide</p> Signup and view all the answers

    Which urinary metabolites result from the nucleophilic attack of GSH on the intermediate epoxide of styrene in rats?

    <p>Isomeric mercapturic acid derivatives</p> Signup and view all the answers

    In drug metabolism, what process involves covalent binding of styrene oxide to rat liver microsomal proteins and nucleic acids?

    <p>Extrahepatic metabolism</p> Signup and view all the answers

    Which metabolite is an important urinary metabolite in humans resulting from the hydration of carbamazepine-10,11-epoxide?

    <p>10,11-dihydroxycarbamazepine</p> Signup and view all the answers

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