A level Biology - Co-transport

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Source: A-level Biology Hiss Estruck YouTube. Co-transport + Active transport + Active PROCESS OF ACTIVE TRANSPORT Ⓒ Transport is through carrier proteins spanning the cell Membrane Molecule binds to a receptor complementary shape on the protein 3 ATP binds to the carrier protein from the inside of the cell and is hydrolysed into ADP + Pi This causes the carrier protein to change shape and release the Molecule to the other side. (3) The phosphate ion is then released and the protein it returns to its original shape. (o- Transport og glucose and sodium cons in the elemen lleum lumen → Epithelia cell Capillary To absorb glucose from the lumen to the gut there Must be a higher concentration of glucose in the lumen compared. to the epithelial cell (for facilitated diffusion). 4) BOT; There is usually more glucose in the epithelial cells. C) That is why active transport and co-transport are required. STEPS IN PROCESS Ⓒ Nations are actively transported out of the epithelial cell into the blood via a carrier protein and ATP. is This reduces the Na+ ion concentration in the epithelial cell 2 Sodium ions can then diffuse from the lumen down their concentration gradient into the epithelial cell (3) The protein the socium ions diffuse through is a co-transpor- ted protein, so either glucose a or amino acids also attach into the epithelial cell against their concentration gradient. (4) Elucose then moves...

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