Contractive responses of arterial strips evoked by electric field stimulation were distinctly enhanced after treatment of arte- rial strip with naloxonc, an opioid receptor blocker, and pronase, but unchanged after treatment with trypsin.

• 动脉条用阿片受体阻断剂纳洛酮或链霉蛋白酶处理后,电场刺激引起的动脉条收缩反应显著增大,但胰蛋白酶无影响。