Question: what are the adrenergic receptors?
Answer: The adrenergic receptors (or adrenoceptors) are a class of metabotropic G protein -coupled receptors that are targets of the catecholamines, especially norepinephrine or noradrenaline, and epinephrine ( adrenaline ). ... There are two main groups of adrenergic receptors, α and β, with several subtypes.