Active Transport Via A Protein Channel Page

One day, a wealthy merchant named Mr. Sodium approached Timmy with a lucrative offer. Mr. Sodium had a shipment of valuable sodium ions that he needed transported into the cell, but the concentration of sodium was much higher outside the cell than inside. The cell's natural tendency was to keep the sodium ions out, but Mr. Sodium was willing to pay top dollar for Timmy's services.

On one side—the side facing the gut—was a wasteland. It was the "low concentration" zone. There were barely any glucose molecules here; they were scarce and lonely. active transport via a protein channel