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Diffusion
2/19/2023
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Diffusion: •Diffusion is the net movement of molecules or ions from a region where they are more highly concentrated to one where their concentration is lower until evenly distributed. Dynamic Equilibrium Inside Inside high concentration gradient outside Ilow concentration gradient Outside 2. Facilitated Diffusion to to pass through. 1. Simple Diffusion (Lipid diffusion) ・Simple diffusion is membranes without faster, · The ions bind with slower, carry Carrier proteins Fick's Law Rate of diffusion = conformational change. dynamic Inside Inside - •They form water-filled hydrophilic ii channels and allow specific water-soluble ions dynamic membrans that contains an appropriate protein. • This is a passive diffusion process it relies only There is no external input of ATP from respiration. Channel Proteins equilibrium the protein causing it when particles can diffuse the help of transport proteins. outside equilibrium • Facilitated diffusion is diffusion using carrier proteins and protein channels. • The transport proteins tend to be specific for one molecule, so substances can only the inbuilt kinetic energy the diffusing molecules. O==0 Outside molecule • When a mo le aule such as glucose specific to the protein is present, it binds with protein. ·Conformational change occurs that the molecule is released inside of the membrane. Only kinetic of energy membrane molecules drive the process. hydrophobic Non-gated channel end hydrophibic end Binding Site !!!V!!! Conc. diff Surface area diffusion distance X a cross cell charged binding iii site of cross a T™ Gated channel O==O -Binding site messenger molecule X=10 M!!!!
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