内皮细胞衬于血管内壁 ,为血流提供光滑的表面 ,维持血液正常流动。此外 ,作为半透膜 ,内皮细胞将血管内、外分开 ,调节血管内、外的物质交换 ,起屏障作用。近年来 ,随着电子显微镜、细胞培养和分子生物学等技术的发展 ,对内皮细胞的认识有了进一步提高。人们发现内皮细胞除上 Endothelial cells lining the inner walls of blood vessels provide a smooth surface for blood flow and maintain normal blood flow. In addition, as a semipermeable membrane, the endothelial cells separate the blood vessel and the blood vessel, regulate the exchange of substances inside and outside the blood vessel, and serve as a barrier. In recent years, with the development of technologies such as electron microscopy, cell culture and molecular biology, the understanding of endothelial cells has been further improved. People found that endothelial cells in addition