Mastering Cardiac Glycosides
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Questions and Answers

Which of the following is a characteristic feature of all cardioactive glycosides?

  • The presence of a β-OH group at position C-14
  • The presence of an OH group at positions C-5, C-11, and C-16
  • The presence of a β-OH group at position C-3
  • The presence of an unsaturated lactone ring at position C-17 (correct)

    • Which of the following is the aglycone of cardiac glycosides?

  • Testosterone
  • Cardiac genin (correct)
  • Corticosteroid
  • Betamethasone

    • Which of the following is the correct structure of cardiac genin?

  • Cyclopentra phenanthrene with a saturated lactone ring at C14
  • Cyclopentra phenanthrene with an unsaturated lactone ring at C17 (correct)
  • Cyclopentra phenanthrene with a saturated lactone ring at C17
  • Cyclopentra phenanthrene with an unsaturated lactone ring at C14

    • What is the general action of cardioactive glycosides on the cardiac muscle?

    <p>Increase tone, excitability, and contractility</p> Signup and view all the answers

    Which of the following is a structural feature of cardioactive glycosides?

    <p>The C/D ring junction is usually cis</p> Signup and view all the answers

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