细胞质膜等生物膜表现出的一种重要的生理功能。细胞质膜能够有选择性地控制营养物质及代谢产物进出细胞，这些进出有时是逆浓度梯度进行的。例如大肠杆菌在生长期中，能有选择地从周围环境中摄取钾离子，以致于细胞内的浓度比环境中的浓度高出三千倍。
将质膜嵌入预先涂制好的平面脂双层，然后用电学方法测定该脂双层的离子选择通透性。
The plasmalemma was incorporated into planar bilayer lipid membrane and ion channels were measured by electrical methods.
微血管内皮细胞层是一层半选择通透性屏障，可以调节血液中的液体、溶质和血浆蛋白进入组织间隙。
The microvascular endothelial cell monolayer is a semi-permeable barrier that regulates the flux of liquid, solutes and plasma proteins between the blood and interstitial space.
结果（1）肺损伤组各时相点血浆P 选择素、肺组织MPO活性、肺毛细血管通透性均较对照组显著增高（P< 0 0 1） ；
Results (1)Plasma P selectin levels, lung MPO, pulmonary capillary permeability at every time points in endotoxin group was much greater than those observed in control group( P< 0 01).
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