Dopamine exerts effects on which receptor types depending on dose?

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Multiple Choice

Dopamine exerts effects on which receptor types depending on dose?

Explanation:
Dopamine’s actions vary with dose through different receptor targets. At low doses it mainly stimulates D1 dopaminergic receptors, causing vasodilation in renal and mesenteric beds. At intermediate doses it stimulates β1 receptors in the heart, increasing heart rate and contractility. At high doses it activates α1 receptors, leading to vasoconstriction. So dopamine can affect dopaminergic, beta-1, and alpha-1 receptors depending on how much is given. A choice that claims only beta-1 receptors are involved misses the dopaminergic and alpha-1 actions at other doses, making it an incomplete representation of dopamine’s receptor effects.

Dopamine’s actions vary with dose through different receptor targets. At low doses it mainly stimulates D1 dopaminergic receptors, causing vasodilation in renal and mesenteric beds. At intermediate doses it stimulates β1 receptors in the heart, increasing heart rate and contractility. At high doses it activates α1 receptors, leading to vasoconstriction. So dopamine can affect dopaminergic, beta-1, and alpha-1 receptors depending on how much is given. A choice that claims only beta-1 receptors are involved misses the dopaminergic and alpha-1 actions at other doses, making it an incomplete representation of dopamine’s receptor effects.

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