Stimulation ofβ₂-receptors results in

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The stimulation ofβ₂-receptors results in smooth-muscle relaxation.Because the blood vessels of the skeletal muscle are innervated byβ₂-receptors,stimulation causes vasodilation.Relaxation of the smooth muscles of the bronchioles,also containingβ₂-receptors,results in bronchodilation.The stimulation of the a-receptors results in smooth-muscle excitation or contraction,which then causes vasoconstriction of skin and skeletal muscle.b₁-receptor stimulation excitation causes stimulation of the heart muscle,resulting in a positive chronotropic effect (increased rate)and a positive inotropic effect (increased strength).

Stimulation Ofβ₂-Receptors Results in