Passive transport: Difference between revisions
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Passive transport is the movement of molecules across the [[ | 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:<br>• Simple diffusion | There are two types of passive transport:<br>• Simple diffusion | ||
Non-polar, water, small, hydrophobic molecules can cross the membrane by simple diffusion<br>• Facilitated diffusion<br>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)<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 />''' | '''<references />''' | ||
Revision as of 23:48, 13 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:
• Simple diffusion
Non-polar, water, small, hydrophobic molecules can cross the membrane by simple diffusion
• Facilitated 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