U2) Facilitated diffusion 0.0 / 5 ? BiologyCellular processesA2/A-levelAQA Created by: lieselb12Created on: 19-04-20 16:23 What is facilitated diffusion? The molecules moving accross the membrane through channel or carrier proteins 1 of 9 What molecules do this? Large and polar or charged ions. 2 of 9 What is the net movement? Down concentration gradient from high to low 3 of 9 What process is it and does it need energy? Passive + no energy needed 4 of 9 What is water's channel protein called? Aquaporin 5 of 9 What factors affect facilitated diffusion? difference in concentration gradient + surface area+ diffusion pathway + number of proteins present + surface area of membrane proteins 6 of 9 What do carrier proteins carry? Large poler molecules 7 of 9 What carries charged ions? Channel proteins ( each ion has a specific protein) 8 of 9 What Fick's law? (difference in concentration gradient x surface area) / diffusion pathway length 9 of 9
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