12 Questions
What is the primary action of dopamine on the peripheral vasculature?
Vasodilatation
What is the effect of low-dose dopamine on the renal blood flow?
Increases renal blood flow
Which of the following is a selective α₁ agonist?
Phenylephrine
What is the therapeutic use of clonidine?
Hypertension
What is the effect of methyl dopa on sympathetic outflow?
Decreases sympathetic outflow
What is the therapeutic use of ritodrine?
Reduces uterine contraction
What is the primary effect of norepinephrine on the heart?
Increases both systolic and diastolic blood pressure and produces a reflexed bradycardia
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
What is the contraindication for norepinephrine that is similar to epinephrine?
Hypertension
What is the effect of norepinephrine on blood pressure?
Increases both systolic and diastolic blood pressure
What is the therapeutic use of norepinephrine?
Treatment of acute hypotension and shock
What is the effect of alpha blockers on the presser effect of norepinephrine?
Alpha blockers abolish the presser effect but do not reverse it
This quiz covers the functions and mechanisms of dopamine, a chemical transmitter in the central nervous system. It stimulates different receptors, producing various effects on the peripheral nervous system and vascular beds. Test your knowledge of dopamine's role in the body.
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