Ion-driven active transport

In this case, the movement   of the molecule   to be transported   across   the membrane is coupled to the movement of an ion, commonly either Na ⁺or H⁺   . The energy  for  the  movement  of  the  molecule  across  the  membrane  against  its concentration  gradient comes from the movement of the ion down its concentration gradient if the both molecule and the ion move in the similar direction,  it is termed symport,  and the protein included  in the procedure  is called a symporter if the molecule  and the ion move in the opposite direction, it is termed antiport, and the protein included in the procedure is known an antiporter for instance erythrocyte band 3 anion transporter.