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active transport  Active transport: moving against a gradient To move substances against a concentration or electrochemical gradient, a cell must use energy Active transport Active transport Feedback Active transport is the transfer of substances across the cell membrane, which, unlike passive transport , is associated with

Secondary active transport combines or couples the transport proteins to the movement of ions or charged molecules down their concentration gradient to another Primary active transport, also called direct active transport, directly uses metabolic energy to move molecules across a membrane against their

ATE is an executive agency, sponsored by the Department for Transport Read more about what we do Follow us The following links open in a new tab  Some active transport mechanisms move small-molecular weight materials, such as ions, through the membrane Other mechanisms transport much