<prompt> The action of Adrenergic a2 receptors and b1 receptors on adenyl cyclase?Stimulate; StimulateStimulate; InhibitInhibit; InhibitInhibit; Stimulate  <response>: Most of the receptors are G protein-coupled receptors .Among G protein-coupled receptors, Inhibitory receptors are Alpha 2, M2 etcStimulatory receptors are all beta receptors beta 1, beta2 and beta 3 Ref: H.L Sharma 3rd ed. Pg: 64 