A cotransporter is something that moves two substances across a membrane, one passively and the other actively. The Na+/ K+ ATPa
se transports sodium and potassium ions across the plasma membrane against their concentration gradients. This pump is not considered a cotransporter because
If both ions are being transported against their concentration gradients, then they are both being transported by active transport, as it requires energy.
A co-transporter moves two substances across the membrane, one passively and one actively. But in this case neither ion is moved passively, so it cannot be considered a cotransporter
