The protein embedded in the plasma membrane that allows the sodium ions to the cross that membrane would be functioning as the transport protein
The Transport proteins or the transmembrane proteins are the only membrane proteins that also help in the movement of the ions across the hydrophobic lipid bilayer by the acilitated diffusion or the active transport. Transport proteins are the proteins that transport the substances across the biological membranes. Transport proteins are the found within the membrane itself, where they form the channel, or they carrying mechanism, to allow their substrate to pass from one side to the other side
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