facilitated diffusion

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Dr.Waqas Nawaz PMAS arid agriculture university rawalpindi

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  • 1. SUBMITTED TO:Dr. FEROZA WATTOOSUBMITTED BY:WAQAS NAWAZ 11-arid-975ZAHID NAZIR 11-arid-976ZEESHAN AHMED 11-arid-978

2. BIOCHEMISTRY-101 3. Large polar molecules such asglucose and amino acids, cannotdiffuse across the phospholipidbilayer. Also ions such as Na+ orCl- cannot pass. These molecules pass throughprotein channels instead.Diffusion through thesechannels is calledFACILITATED DIFFUSION. Movement of molecules is stillPASSIVE just like ordinarydiffusion, the only difference is,the molecules go through aprotein channel instead ofpassing between thephospholipids. AS Biology, Cell membranes and Transport 4 4. Gas exchange at the alveoli oxygen from air toblood, carbon dioxide from blood to air. Gas exchange for photosynthesis carbondioxide from air to leaf, oxygen from leaf to air. Gas exchange for respiration oxygen fromblood to tissue cells, carbon dioxide in oppositedirection. Transfer of transmitter substance acetylcholine from presynaptic to postsynapticmembrane at a synapse. Osmosis diffusion of water through asemipermeable membrane. 5. AS Biology, Cell membranes and Transport 6 6. Cell membraneProtein channelInside cellOutside cellAS Biology, Cell membranes and Transport 7 7. Cell membranediffusion Protein channelInside cell Outside cell AS Biology, Cell membranes andTransport 8 8. Cell membranediffusion Protein channelInside cell Outside cell EQUILIBRIUM AS Biology, Cell membranes andTransport 9 9. AS Biology, Cell membranes and Transport 10 10. AS Biology, Cell membranes and Transport 11 11. Two major groups of integral membraneproteins are involvedin facilitateddiffusion; Carrier proteins Ion ChannelsIon channels allow currents to be carriedacross the membrane and are thus ofparticular importance in the physiology ofexcitable cells like neurons 12. Bind a specific type of solute Discharges the solute Certain of the hexose transporters, which transportglucose and similar monosaccharides into and out ofcells 13. Not really bind the solute Faster than by carrier proteins Contain a "gate" which is functions to controlthe channels permiability

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