Which of the following adrenergic agonists is classified as a non-selective direct-acting catecholamine that stimulates alpha-1, alpha-2, beta-1, and beta-2 receptors?
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Correct answer: Epinephrine
Epinephrine acts on all major adrenoreceptors. At low doses, beta effects (vasodilation) predominate, while at high doses, alpha effects (vasoconstriction) are more prominent.
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