Passive transport
Transport that does not require energy / From Wikipedia, the free encyclopedia
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Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes.[1][2] Instead of using cellular energy, like active transport,[3] passive transport relies on the second law of thermodynamics to drive the movement of substances across cell membranes.[1][2][4] Fundamentally, substances follow Fick's first law, and move from an area of high concentration to an area of low concentration because this movement increases the entropy of the overall system.[4][5] The rate of passive transport depends on the permeability of the cell membrane, which, in turn, depends on the organization and characteristics of the membrane lipids and proteins.[citation needed] The four main kinds of passive transport are simple diffusion, facilitated diffusion, filtration, and/or osmosis.
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Passive transport follows Fick's first law.