blood flow changes in the periodontal ligament ( pdl ) were measured indirectly by monitoring the local clearance of 125i- during electric sympathetic nerve stimulation or close intra-arterial infusions of either noradrenaline ( na ) or adrenaline ( adr ) before and after administration of phentolamine ( pa ) , phenoxybenzamine ( pbz ) , or idazoxan ( rx ) .
C0028351
noradrenaline
C0014563
adrenaline