Membrane Transport Dr. Sadaf Mumtaz 9/12/11.

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Presentation transcript:

Membrane Transport Dr. Sadaf Mumtaz 9/12/11

Unassisted transport Diffusion Random motion of molecules among one another in liquids or in gases Concentration gradient/Chemical gradient Difference in concentration between two adjacent areas Net Diffusion Difference between two opposing movements Steady state

Fick’s Law of Diffusion Net rate of diffusion = C. P. A MW. D Membrane potential or electrical gradient

Diffusion through protein channels

Osmosis Net movement of water caused by concentration difference of water.

Carrier Mediated transport Specificity Saturation Competition

Assisted Membrane transport Facilitated diffusion Active transport Secondary active transport

Facilitated diffusion

Active transport

Na-K pump

Secondary active transport

Counter-transport

Thanks 5th Jan 2010