Adrenoceptors Physiological Responses
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Questions and Answers

Which of the following statements about catecholamines is correct?

  • They have poor penetration into the central nervous system (CNS).
  • They are highly potent in activating α or β receptors. (correct)
  • They have a prolonged duration of action when administered orally.
  • They are not readily metabolized by COMT or MAO.

    • Which of the following compounds is a non-catecholamine?

  • Epinephrine
  • Isoproterenol
  • Amphetamine (correct)
  • Norepinephrine

    • What is a characteristic of non-catecholamines compared to catecholamines?

  • They are less potent in activating α or β receptors.
  • They have poorer penetration into the central nervous system (CNS).
  • They have a shorter half-life due to rapid metabolism by COMT.
  • They have a longer duration of action due to reduced metabolism by MAO. (correct)

    • Which of the following statements accurately describes direct-acting adrenergic agonists?

    <p>They act directly on α or β receptors, mimicking sympathetic stimulation.</p> Signup and view all the answers

    What is the primary mechanism of action for indirect-acting adrenergic agonists?

    <p>They block the reuptake of norepinephrine or cause its release from adrenergic neurons.</p> Signup and view all the answers

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