Pressor area 1a Neuronal Sympathetic tonus t Vessel stretch Myogenic reaction 2a local Port Endothelin-1 1 (ETA) PGF2a, thromboxane Constriction ADH (V1), epinephrine (a1), angiotensin lI За Hormonal 1b Neuronal Sympathetic tonus Dilation Parasympathetic system (salivary glands, genitalia) Poz Adenosine, Pco,4 H*, K* etc. NOT PGE2, PGI21 2b local EDHF. Bradykinin, 4 kallidin Epinephrine (B2) 3b Hormonal Acetylcholine (M), АТР, #histamine (H1), endothelin-1 (ETB)