Passive transport: Difference between revisions
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Passive transport is the movement of molecules across the [[Plasma membrane|plasma membrane down]] the concentration gradient without the input of energy<ref>Alberts, B., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P.( | Passive transport is the movement of molecules across the [[Plasma membrane|plasma membrane down]] the concentration gradient without the input of energy<ref>↑ Alberts, B., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P. (2008) Molecular biology of the cell, 5th edition, Garland science.</ref>. | ||
There are two types of passive transport: | There are two types of passive transport: | ||
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*[[Facilitated diffusion|Facilitated diffusion]] | *[[Facilitated diffusion|Facilitated diffusion]] | ||
Many [[Molecules|molecules]] ([[Polar|polar]], charged, large, and [[Hydrophilic|hydrophilic]]) can not cross the [[Plasma membrane|plasma membrane]], so the passage of these molecules is facilitated by membrane transport proteins (channel or carrier [[Proteins|proteins]])<ref>Alberts, B., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P.( | Many [[Molecules|molecules]] ([[Polar|polar]], charged, large, and [[Hydrophilic|hydrophilic]]) can not cross the [[Plasma membrane|plasma membrane]], so the passage of these molecules is facilitated by membrane transport proteins (channel or carrier [[Proteins|proteins]]) <ref>↑ Alberts, B., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P. (2008) Molecular biology of the cell, 5th edition, Garland science.</ref>. <br> | ||
=== References: === | === References: === | ||
<references /> | <references /> | ||
Revision as of 18:29, 14 November 2011
Passive transport is the movement of molecules across the plasma membrane down the concentration gradient without the input of energy[1].
There are two types of passive transport:
Non-polar, water, small, hydrophobic molecules can cross the membrane by simple diffusion
Many molecules (polar, charged, large, and hydrophilic) can not cross the plasma membrane, so the passage of these molecules is facilitated by membrane transport proteins (channel or carrier proteins) [2].