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A hitch-hiker's guide to the galaxy of adrenoceptors.

The characteristic effects of activity of the sympathetic nervous system result from the action of the catecholamines noradrenaline and adrenaline on specialised components of cells called adrenoceptors (less correctly adrenergic receptors). Virtually every tissue has a noradrenergic innervation and is exposed to circulating adrenaline and noradrenaline, which evoke a wide variety of responses (table I).