Pharmacology of Agonist and Antagonist Relationships
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Questions and Answers

What is the effect of a small dose of Ach administered before atropine?

  • Increased heart rate
  • Stimulation of nicotinic receptors
  • No effect on heart rate
  • Decreased heart rate (correct)

    • What is the effect of a small dose of adrenaline administered in a new non-pretreated preparation?

  • Decrease in heart rate
  • Increase in blood pressure (correct)
  • No effect on blood pressure
  • Vasoconstriction

    • What is the effect of atropine on the action of Ach?

  • Blocks the effect of Ach (correct)
  • Reverses the effect of Ach
  • Enhances the effect of Ach
  • Has no effect on the action of Ach

    • What is the effect of prazosin on the action of adrenaline?

    <p>Blocks the effect of adrenaline on alpha-1 receptors</p> Signup and view all the answers

    What is the effect of a large dose of Ach administered after atropine?

    <p>Increased heart rate</p> Signup and view all the answers

    What is the effect of propranolol on the action of adrenaline?

    <p>Blocks the effect of adrenaline on beta receptors</p> Signup and view all the answers

    What is a characteristic of an agonist drug?

    <p>It has structural features that allow it to fit properly on its receptors</p> Signup and view all the answers

    What is the primary mechanism of action of a competitive antagonist?

    <p>It competes with the agonist for receptor binding sites</p> Signup and view all the answers

    What is the effect of an antagonist on the action of an agonist?

    <p>It prevents the agonist from combining with its receptors</p> Signup and view all the answers

    What is the effect of a non-competitive antagonist on the dose-response curve of the agonist?

    <p>It shifts the curve downwards</p> Signup and view all the answers

    What is the intrinsic activity of a partial agonist compared to a full agonist?

    <p>It is less than 1</p> Signup and view all the answers

    What is the result of administering a competitive antagonist to a system with an agonist present?

    <p>The agonist is displaced from the receptor binding sites</p> Signup and view all the answers

    What is the primary difference between an agonist and an antagonist?

    <p>Their ability to elicit a response</p> Signup and view all the answers

    What is the effect of a partial agonist on the response of a full agonist?

    <p>It decreases the response of the full agonist</p> Signup and view all the answers

    In the sequence of drug administration, what is the purpose of the second dose of Ach?

    <p>To test the reversibility of the antagonist</p> Signup and view all the answers

    What is the characteristic of a non-competitive antagonist's binding to the receptor?

    <p>It is irreversible</p> Signup and view all the answers

    What can be said about the intrinsic activity of a pure antagonist?

    <p>It is equal to 0</p> Signup and view all the answers

    What is the expected observation after administering Atropine in the sequence of drug administration?

    <p>A decrease in the frequency of receptor activation</p> Signup and view all the answers

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