across a is a type of passive transport or transport across the cell membrane that does not require energy. Passive diffusion is simply based on the difference in the potential. Diffusion across a cell membrane is a type of passive transport or transport across the cell membrane that does not require energy. Facilitated diffusion is the process of passive transport of molecules or ions across a biological membrane via specific transmembrane integral . is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration in the direction that tends to equalize the solute concentrations on the two sides.
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