Facilitated diffusion 0.0 / 5 ? BiologyCellular processes and structureASAQA Created by: aarafa11Created on: 19-11-17 18:52 Why we need it? Plasma membrane is not readily permeable to molecules charged ions and polar molecule don't diffuse due to a hydrophobic tail ONLY SMALL, NON-POLAR MOLECULES 1 of 3 How does it work By transmembrane channel /carrier (CARRIER PROTEIN AND PROTEIN CHANNELS) Carrier protein molecules (O2) that are specific to the protein will bind to it it'll change the shape of the protein the molecule will be released inside the membrane no external energy Protein channel water filled hydrophilic channels which are specific allow specific water-soluble ions control over entry and exit of ions Passive process inbuilt kinetic energy (NO ATP) 2 of 3 Role in diffusion Theres a high concetration of amino acid and glucose within the ileum than the blood Therefore, a concentration gradient Glucose moves down by FACILIATED DIFFUSION into blood The glucose is continueously being removed by cells during RESPIRATION Blood is circulated by the heart This MAINTAINS a concentration gradient Therefore, the rate of movement by diffusion is INCREASED 3 of 3
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