A normal healthy cell is bathed in a normal extracellular saline. The plasma membrane of the cell contains voltage-gated sodium channels, sodium-glucose co-transporters, and sodium-potassium ATPase pumps.
Via which of these spanning proteins is the net flux of sodium ions from a region of high concentration of sodium to a region of low concentration of sodium? The movement of sodium ions via
A. an open voltage-gated sodium channel.
B. the sodium-glucose secondary active cotransporter.
C. the sodium-potassium ATPase primary active transport pump.