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Membranes, Proteins, carbohydrates, phospolipids: amphipathic molecules,…
Membranes
substance/water balance
Diffusion: The movement of particles of any substance so that they spread out evenly into the available space
Concentration gradient: the region along which the density of a chemical substance increases or decreases
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transports
Active transport: requires energy, usually in the form of ATP hydrolysis, to move substances against their concentration gradients
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exocytosis: transport vesicles migrate to the membrane, fuse with it, and release their contents outside the cell
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