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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?

Hypertension Signup and view all the answers

What is the effect of methyl dopa on sympathetic outflow?

Decreases sympathetic outflow Signup and view all the answers

What is the therapeutic use of ritodrine?

Reduces uterine contraction Signup and view all the answers

What is the primary effect of norepinephrine on the heart?

Increases both systolic and diastolic blood pressure and produces a reflexed bradycardia Signup and view all the answers

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

Epinephrine acts on both alpha and beta receptors, while norepinephrine acts mainly on alpha receptors Signup and view all the answers

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

Hypertension Signup and view all the answers

What is the effect of norepinephrine on blood pressure?

Increases both systolic and diastolic blood pressure Signup and view all the answers

What is the therapeutic use of norepinephrine?

Treatment of acute hypotension and shock Signup and view all the answers

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

Alpha blockers abolish the presser effect but do not reverse it Signup and view all the answers