They help transfer substances from the outside of the cell membrane to the inside.
Active transport involves carrier proteins. Carrier proteins bind themselves to particles and transport them to highly concentrated areas within a cell.Facilitated diffusion and active transport require carrier proteins.
Active
carrier proteins transport glucose into a muscle cell
Carrier Proteins
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Carrier proteins of the cell membrane transport substances down their concentration gradient out of or into the cell by facilitated diffusion and active transport.
Carrier Proteins. Some don't require ATP (Facillitated transport) and some do require ATP (Active transport) to change shape.
substance to pass
Active transport requires energy, unlike passive transport. The carrier proteins in active transport act as a "pump" ( fueled by ATP) to carry/attach themselfves to useful proteins for the cell.
sodium-potassium pump.
A carrier protein (as opposed to a channel protein). An example of a carrier protein is the Na+/K+ pump.
facillitated diffusion and active transport