Which catecholamine is the primary endogenous ligand for both alpha and beta-adrenergic receptors and is the first-line treatment for anaphylactic shock?
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Correct answer: Epinephrine
Epinephrine is a non-selective agonist at all adrenergic receptors. In anaphylaxis, its alpha-1 effects reduce mucosal edema and hypotension, while its beta-2 effects provide life-saving bronchodilation and stabilization of mast cells.
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