A particular co-transporter uses the concentration gradient of na+ to move an amino acid into the cell. what immediate effect would raising the extracellular na+ have? it would…
a. increase the amino acid's rate of entry into the cell.
b. block the movement of the amino acid into the cell.
c. block the na+ / k+ pump.
d. speed up the na+ / k+ pump.
e. reverse the direction of the na+ / k+ pump so that it moves na+ and k+ down their concentration gradients.