Active Tubular Secretion Mechanisms Quiz
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Questions and Answers

What is the main requirement for active tubular secretion?

  • Passive diffusion
  • Dependence on renal blood flow
  • Energy for transportation of compounds with the concentration gradient
  • Carrier-mediated process (correct)
  • Which compounds are secreted through the system for organic acids/anions?

  • Uric acid and morphine
  • Glucuronides and sulphates (correct)
  • Salts and sugars
  • Catecholamines and choline
  • What is the renal clearance value for penicillin, indicating its active secretion?

  • 500 ml/min (correct)
  • 200 ml/min
  • 700 ml/min
  • 130 ml/min
  • How are drugs undergoing active secretion affected by changes in pH and protein binding?

    <p>They are unaffected</p> Signup and view all the answers

    What is unique about the system for secretion of organic bases/cations?

    <p>It can be bidirectional, i.e. agents may both be secreted as well as reabsorbed actively</p> Signup and view all the answers

    What is the primary location where active secretion occurs in the nephron?

    <p>Proximal tubule</p> Signup and view all the answers

    How does a drug with greater rate of clearance affect the excretion of another drug with which it competes?

    <p>It retards the excretion of the other drug</p> Signup and view all the answers

    What is the therapeutic effect of probenecid on organic acids such as penicillins?

    <p>It increases their concentration in plasma by at least two fold</p> Signup and view all the answers

    Why is inhibition of drug secretion by probenecid undesirable in the case of nitrofurantoin?

    <p>Nitrofurantoin is used as a urinary tract antiseptic</p> Signup and view all the answers

    What is cimetidine known for being a competitive inhibitor of?

    <p>Organic cation transport</p> Signup and view all the answers

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