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    被动运输（passive transport）

    互联网

    1714

    　　 物质在细胞内外浓度不同形成梯度。物质顺着梯度由高浓度向低浓度转运的过程叫被动运输。被动运输的动力是物质浓差，不需要消耗细胞代谢能（如水解ATP所释放的能量）或其他能量。自由扩散、促进扩散属于被动运输。

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