Denne proces er af grundlæggende betydning for cellernes optagelse af molekyler imod elektrokemiske gradienter og koncentrationsgradienter, for nervers og musklers elektro-fysiolo'gi samt for syre-basereguleringen '·2
This process is fundamental to the cellular uptake of molecules against electrochemical and concentration gradients, to the electro-physiology of nerves and muscle, and to acid-base regulation ''2