Propranolol 05 oK qg I ugkg Epinephrine I ug/kg Epinephrine Cardiac contractile force 200 Artenal pressure 100 ( mm Hg) AAAM 200 Heart rate I min (beats/min) Blockade of B-adrenoceptor cardial responses y propranololBlockade of –adrenoceptor cardial responses by propranolol