Dopamine Receptors and Functions
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Questions and Answers

What is the primary action of dopamine on the peripheral vasculature?

  • Decreases renal blood flow
  • Vasoconstriction
  • Increases peripheral resistance
  • Vasodilatation (correct)

What is the effect of low-dose dopamine on the renal blood flow?

  • Increases renal blood flow (correct)
  • Vasoconstriction
  • Decreases renal blood flow
  • Has no effect on renal blood flow

Which of the following is a selective α₁ agonist?

  • Clonidine
  • Methyldopa
  • Phenylephrine (correct)
  • Salbutamol

What is the therapeutic use of clonidine?

<p>Hypertension (B)</p> Signup and view all the answers

What is the effect of methyl dopa on sympathetic outflow?

<p>Decreases sympathetic outflow (A)</p> Signup and view all the answers

What is the therapeutic use of ritodrine?

<p>Reduces uterine contraction (D)</p> Signup and view all the answers

What is the primary effect of norepinephrine on the heart?

<p>Increases both systolic and diastolic blood pressure and produces a reflexed bradycardia (C)</p> Signup and view all the answers

What is the main difference between epinephrine and norepinephrine in terms of receptor action?

<p>Epinephrine acts on both alpha and beta receptors, while norepinephrine acts mainly on alpha receptors (C)</p> Signup and view all the answers

What is the contraindication for norepinephrine that is similar to epinephrine?

<p>Hypertension (D)</p> Signup and view all the answers

What is the effect of norepinephrine on blood pressure?

<p>Increases both systolic and diastolic blood pressure (D)</p> Signup and view all the answers

What is the therapeutic use of norepinephrine?

<p>Treatment of acute hypotension and shock (A)</p> Signup and view all the answers

What is the effect of alpha blockers on the presser effect of norepinephrine?

<p>Alpha blockers abolish the presser effect but do not reverse it (C)</p> Signup and view all the answers

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