Unformatted text preview: systems. Diffusion across a membrane 8. The rate of diffusion through a cell membrane depends on the ability of the molecule to dissolve in the lipid layer of the membrane. Only lipid-soluble (lipophilic) molecules can diffuse across the membrane by simple diffusion. 9. The rate of diffusion through a membrane is directly proportional to the surface area of the membrane. The larger the surface area, the more molecules can diffuse across per unit time. 10. The rate of diffusion across a membrane is inversely proportional to the thickness of the membrane. The thicker the membrane, the slower diffusion will take place. (Reference: Table 5-2, Human Physiology, 3 rd Ed ., by Dr. Dee Silverthorn)...
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- Fall '08
- Biology, Molecule, Molecular diffusion