1.Water-soluble substances, like ions, cross the capillary wall through either water-filled spaces, called clefts, between the endothelial cells, or through large pores in the walls of fenestrated capillaries.
溶性物质,如
,
过内皮
胞间的
间(裂缝),穿过毛
血管壁或由有孔毛
血管壁的小孔穿过。