Keywords vascular endothelium;patch-clamp techniques;chloride channels;umbilical veins;cyclic AMP;calcium;adenosine triphosphate;verapamil;

• 血管内皮;膜片箝技术;氯通道;脐静脉;环腺苷一磷酸;钙;腺苷三磷酸;维拉帕米;