Effects of Autonomic Drugs on Blood Pressure and Heart Rate
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Questions and Answers

What is the primary effect of noradrenaline on blood pressure?

  • It causes a decrease in blood pressure due to stimulation of β2 receptors
  • It causes an increase in blood pressure due to stimulation of α1 receptors (correct)
  • It has no effect on blood pressure
  • It causes a decrease in blood pressure due to stimulation of β1 receptors

    • What is the effect of noradrenaline on heart rate?

  • It has no effect on heart rate
  • It causes a decrease in heart rate due to stimulation of β1 receptors
  • It causes a decrease in heart rate due to stimulation of β2 receptors
  • It causes an increase in heart rate due to stimulation of β1 receptors (correct)

    • What is the effect of prazosin on the action of noradrenaline on blood pressure?

  • It abolishes the effect of noradrenaline on blood pressure (correct)
  • It enhances the effect of noradrenaline on blood pressure
  • It has no effect on the action of noradrenaline on blood pressure
  • It reverses the effect of noradrenaline on blood pressure

    • What type of receptor is isoprenaline selective for?

    <p>Non-selective β-agonist</p> Signup and view all the answers

    What is the effect of isoprenaline on heart rate before administering propranolol?

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

    What is the effect of noradrenaline on heart rate, considering the reflex response?

    <p>It causes a decrease in heart rate</p> Signup and view all the answers

    What is the primary mechanism of action of isoprenaline?

    <p>It stimulates β1 and β2 receptors</p> Signup and view all the answers

    What is the primary function of propranolol in the experiment?

    <p>Blocking β receptors</p> Signup and view all the answers

    What is the effect of isoprenaline on blood pressure before administering propranolol?

    <p>Decrease in blood pressure</p> Signup and view all the answers

    What is the mechanism of action of adrenaline (epinephrine)?

    <p>Direct binding to all types of adrenergic receptors</p> Signup and view all the answers

    What is the purpose of administering prazosin in the experiment with adrenaline?

    <p>To block α1 receptors</p> Signup and view all the answers

    What is the effect of isoprenaline on blood pressure and heart rate after administering propranolol?

    <p>No change in blood pressure and heart rate</p> Signup and view all the answers

    What is the effect of a large dose of adrenaline on blood pressure after administering prazosin?

    <p>It decreases blood pressure due to the stimulation of β2 receptors.</p> Signup and view all the answers

    What is the reason for the increase in heart rate after administering a large dose of adrenaline after prazosin?

    <p>Stimulation of β1 receptors.</p> Signup and view all the answers

    What is the effect of propranolol on the heart rate?

    <p>It decreases heart rate due to the blockade of β1 receptors.</p> Signup and view all the answers

    What is the response of blood pressure to a large dose of adrenaline after administering propranolol?

    <p>It increases blood pressure due to the stimulation of α1 receptors.</p> Signup and view all the answers

    Why is there no biphasic response of adrenaline after administering prazosin?

    <p>Because prazosin blocks only α1 receptors.</p> Signup and view all the answers

    What is the purpose of administering propranolol before administering adrenaline in the experiment?

    <p>To block β1 receptors and study their effect on heart rate.</p> Signup and view all the answers

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