Symporter

The movement of the ion(s) across the membrane is facilitated diffusion, and is coupled with the active transport of the molecule(s).

SGLT1 in the intestinal epithelium transports sodium ions (Na+) and glucose across luminal membrane of the epithelial cells so that it can be absorbed into the bloodstream.

Amino acids and sugars are taken up from sea water in the presence of extracellular sodium and is driven by the NA+/K+-ATPase pump.

This group of carriers all contribute to modulate the chemiosmotic potential inside the cell.

This change in both the pH and electrochemical potential gradient between the inside of the cell and the outside produces a proton-motive force, as the protons will want to naturally flow back into the area of low concentration and with a voltage closer to zero from their current situation of being in an area of high concentration of positively charged protons.