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Unformatted text preview: electrochemical gradient, rate of facilitated diffusion is much higher than passive diffusion, specific, saturable transport; examples: ion channels, glucose transport into cells, ATP transport out of the mitochondrion o Ion channels: pore-forming proteins that help establish and control the small voltage gradient across the plasma membrane of all living cells (see cell potential) by allowing the flow of ions down their electrochemical gradient Passive diffusion: t ransport of a substance across a cell membrane by diffusion; expenditure of energy is not required...
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This note was uploaded on 04/23/2011 for the course BIME 2102 taught by Professor Kim during the Spring '11 term at UVA.
- Spring '11