⚡ = moves substances from low → high concentration (against the gradient). Requires energy (ATP).
It is easy to confuse these two because both often use . active transport high to low
This creates a gradient, effectively "charging the battery" of the cell. ⚡ = moves substances from low → high
While it sounds like a contradiction—since "active transport" is defined by moving substances a gradient—the phrase "active transport high to low" usually refers to the specific biological mechanisms that maintain high concentrations of molecules on one side of a membrane, or the unique instances where active processes "reset" a system so that passive flow can happen later. active transport high to low