cell surface proteins that bind catecholamines with high affinity and trigger intracellular changes which influence the behaviour of cells. The catecholamine messengers epinephrine, norepinephrine, and dopamine are synthesised from tyrosine by a common biosynthetic pathway.
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Norepinephrine, known as noradrenaline outside the USA, is a catecholamine and a phenethylamine with chemical formula C8H11NO3. It is released ... among other projections. At synapses it acts on both alpha and beta adrenoreceptors. There are two groups of mutually antagonistic metabolic hormones ...
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