1.2细胞膜的跨膜物质转运(Transport of substances through the cell membrane) 1.2.1被动转运 (Passive transport) Transported Uniport molecules 物质顺电化学梯度的转运过程。 Carrier● Channelmolecule 特点：①不耗能(no consumption of energy); ②顺电化学梯度(down the electro-chemical gradient) 分类：①单纯扩散(simple diffusion);②易化扩散 Simple diffusion Faclitated diffusion (facilitated diffusion) Passive transport1.2 细胞膜的跨膜物质转运(Transport of substances through the cell membrane) 物质顺电化学梯度的转运过程。 1.2.1被动转运 (Passive transport) 特点： ①不耗能(no consumption of energy); ②顺电化学梯度(down the electro-chemical gradient) 分类:①单纯扩散(simple diffusion)；②易化扩散 (facilitated diffusion)