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==Introduction==
==Introduction==
<big>'''Q = DA((C<sub>1</sub> - C<sub>2</sub>) ÷ L)'''</big>
<big>'''Q = DA((C<sub>1</sub> - C<sub>2</sub>) ÷ L)'''</big>
'''Q''' = the transport rate of a substance by diffusion
'''Q''' = the transport rate of a substance by diffusion
'''D''' = The diffusion coefficient
'''D''' = The diffusion coefficient
'''A''' = The cross sectional area which the substance is to diffuse across
'''A''' = The cross sectional area which the substance is to diffuse across
'''C<sub>1</sub> C<sub>2</sub>''' = The concentrations in the two areas
'''C<sub>1</sub> C<sub>2</sub>''' = The concentrations in the two areas
'''L''' = distance separating the two areas
'''L''' = distance separating the two areas
==Diffusion Through the Lipid Bilayer==
==Diffusion Through the Lipid Bilayer==
* Lipid soluble substances are able to diffuse freely across the [[Introduction to the Phospholipid Bilayer - Anatomy & Physiology|lipid bilayer of cells.]]
* Lipid soluble substances are able to diffuse freely across the [[Phospholipid Bilayer - Anatomy & Physiology|lipid bilayer of cells.]]
* This occurs passively down the concentration gradient.
* This occurs passively down the concentration gradient.
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[[Category:Transport Across Membranes]]
[[Category:Transport Across Membranes]]