the magnitudes of hyperpolarisations elicited by noradrenaline were significantly reduced by the non-specific alpha-adrenoceptor antagonist phentolamine ( 10 mumol/l ) , the alpha 1-adrenoceptor antagonist prazosin ( 1 mumol/l ) and the beta-adrenoceptor antagonist propranolol ( 5 mumol/l ) .
C0034784
alpha-adrenoceptor
C0001638
alpha