The movement of molecules across a membrane from an area of higher concentration to an area of lower concentration with the use of a carrier molecule embedded in the membrane is called

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Facilitated diffusion involves the use of carrier molecules embedded in the membrane to help transport molecules across the membrane from an area of higher concentration to an area of lower concentration. Osmosis is the movement of water across a membrane from an area of lower solute concentration to an area of higher solute concentration. Passive diffusion does not involve the use of carrier molecules, and instead relies on the natural movement of molecules from an area of higher concentration to an area of lower concentration. Active transport requires the use of energy to move molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration.

The Movement of Molecules Across a Membrane from an Area