Primary directly uses metabolic energy (ATP) to transport

Primary directly uses metabolic energy (ATP) to transport molecules across a membrane. However in secondary active transport also known as coupled transport or co-transport (like simport or antiport) energy is used to transport molecules across a membrane but in secondary active transport there is no direct coupling of ATP; instead it relies upon the electrochemical potential difference created by pumping ions in and out of the cell (ion gradient).

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