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How do substances travel across the cell membrane?
Substances travel across the plasma membrane (cell membrane) through three different processes: Simple passive diffusion, Facilitated diffusion (by channels and carriers), and Active transport.
The plasma membrane is called a selectively permeable membrane because it permits only certain molecules to move in and out of the cell. All molecules are not free to diffuse into the cell.
Updated on: 16-Jan-2023
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