The process does not require energy expenditure, and transport against a concentration gradient does not occur.

这种转运过程不消耗能量，也不会导致逆浓度梯度转运的发生。

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Active transport The use of energy to move a solute across a membrane against a concentration gradient, a potential gradient, or both (electrochemical potential) . Uphill transport.

主动吸收：亦称代谢吸收。指细胞直接利用能量做功，逆着电化学势梯度吸收离子的过程。

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Active transport The use of energy to move a solute across a membrane against a concentration gradient, a potential gradient, or both (electrochemical potential) . Uphill transport.

主动吸收：亦称代谢吸收。指细胞直接利用能量做功，逆着电化学势梯度吸收离子的过程。

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