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.(2002)Molecular Biology of the Cell, fourth edition, New York: Garland Science</ref>. | 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.(2002)Molecular Biology of the Cell, fourth edition, New York: Garland Science</ref>. | ||
There are two types of passive transport: | There are two types of passive transport: | ||
*[[Simple diffusion|Simple diffusion]] | |||
Non-polar, [[Water|water]], small, [[Hydrophobic|hydrophobic]] [[Molecules|molecules]] can cross the membrane by simple 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.(2002)Molecular Biology of the Cell, fourth edition, New York: Garland Science</ref>. <br> | |||
=== References: === | |||
'''<references />''' | '''<references />''' | ||
Revision as of 07:11, 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].
References:
- ↑ Alberts, B., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P.(2002)Molecular Biology of the Cell, fourth edition, New York: Garland Science
- ↑ Alberts, B., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P.(2002)Molecular Biology of the Cell, fourth edition, New York: Garland Science