一种物质作用于血管后,能使血管扩张而降低血压,这种物质一直不为人所知。血管是由血管平滑肌组成。根据需要进行收缩、舒张,控制全身的血液输送量和血压。血管内侧复有一层薄内皮细胞,美国的R。法休哥特博士曾用药棉剥取这种细胞观察,发现该处细胞被剥取后,血管只稳定于收缩状态,不舒张。他意识到在内皮细胞中可能有舒张血管的物质存在。于是大胆设想这种物质可能 A substance acting on the blood vessels, can make the blood vessels to dilate and lower blood pressure, this substance has not been known. Blood vessels are composed of vascular smooth muscle. According to the need to shrink, relax, control the body’s blood volume and blood pressure. Inside the blood vessels have a layer of thin endothelial cells, the United States R. France Hugh Goth had cotton stripped with this cell observation and found that the cells were stripped, the blood vessels were stable only in the contracted state, not diastolic. He realized the possible presence of vasodilators in endothelial cells. So boldly imagine this material may be