Active transport is the movement of a substance, such as glucose, against its concentration. It usually moves from low to high concentration, and through the cell membrane.
Active transport is the moving of molecules across the membrane of the cell against the concentration gradient with the use of ATP.
Low to high concentration. Concentration gradient is the diffusion (movement of molecules from regions of low concentration) from high to low with the gradient. Active transport is from low to high, against the gradient.
