THE adrenergic receptors have been broadly classified into two groups: alpha and beta 1. Adrenergic receptors present in the mammalian cardiac muscle are now thought to belong to the beta type ...

Beta-blockers are thought to cause “unopposed alpha receptor agonism.” Since the beta receptors would be occupied by the beta-blockers, substances (epinephrine, norepinephrine, etc.) ...

In unstimulated cells, the state of G alpha (orange circles) is defined by its interaction with GDP, G beta-gamma (purple circles), and a G-protein-coupled receptor (GPCR; light green loops).

Epinephrine 0.15mg (1:2000); prefilled auto-injector; contains sulfites. Epinephrine acts on both alpha- and beta-adrenergic receptors. Through its action on alpha-adrenergic receptors ...