adrenaline released into the circulation can be taken up by the sympathetic nerve ending and as it is re-released as a co-transmitter it enhances exocytotic noradrenaline release by stimulating prejunctional beta-adrenoceptors and as a consequence it contributes to postjunctional alpha 1-adrenoceptor-induced vasoconstriction .
C0014563
adrenaline
C0028351
noradrenaline