Final answer:
True, substances can be cotransported into the cell with sodium ions through a process called secondary active transport or co-transport.
Step-by-step explanation:
True, as sodium moves back into the cell, other substances can be 'dragged along' or cotransported by the same protein, a process known as secondary active transport or co-transport. This phenomenon is accomplished by transport proteins such as symporters, which allow sodium ions to move down their electrochemical gradient and simultaneously pull other molecules, like glucose or amino acids, into the cell against their concentration gradients. This is driven by the energy stored in the sodium ion gradient which is created by primary active transport mechanisms, like the sodium-potassium pump.