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Unformatted text preview: • Molecule size (Smaller molecules often move more easily) • Concentration (Initial rate faster with higher concentration) • Electrical and pressure gradients of the two regions (Greater the gradient differential, the more rapid the diffusion (again, initially)) Materials that may move through membranes by simple diffusion include: • H 2 0 (water) • CO 2 (carbon dioxide) • O 2 (oxygen) • Some small lipid-soluble molecules (alcohol) Note: The movement of water through a differentially permeable membrane in response to solute concentrations, the phenomenon of osmosis, is a special case of diffusion that we shall discuss later...
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.
- Spring '10