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Action potential a, adrenergic receptor Heart, glands, smooth muscle Inactivated: by #MAO by #COMT Capillary Diffusion into blood (raises NE in blood) Activates Inhibits Adrenal medulla #L-tyrosine Varicosities Epinephrine Bloodstream Inactivated (MAO) Ca NE #L-dopa #Dopamine #NE B2 adrenergic receptor CAMPT #PKAT a, adrenergic receptor Re- absorption #Norepinephrine (NE) #Epinephrine #adrenergic receptors 02 #adrenergic receptors 防z