norepinephrine ( ne , 0.05 and 0.1 micrograms x kg-1 x min-1 ) , a mixed alpha 1- to alpha 2-adrenoceptor agonist , phenylephrine ( pe , 0.5 and 1.0 micrograms x kg-1 x min-1 ) , a preferential alpha 1-adrenoceptor agonist , and b-ht 920 ( 1.0 micrograms x kg-1 x min-1 ) , a preferential alpha 2-adrenoceptor agonist , were infused intravenously after ganglionic ( hexamethonium , 30 mg/kg iv ) , beta-adrenoceptor ( propranolol , 1.0 mg/kg iv ) , and muscarinic receptor ( atropine methylbromide , 0.1 mg/kg iv ) antagonism .
C0034783
adrenoceptor
C0001643
beta-adrenoceptor