Methods of transport across cell membranes 0.0 / 5 ? BiologyCellular processesASOCR Created by: Izzy MasonCreated on: 31-03-15 12:28 What is diffusion Net movement of molecules/ions from an area of high concentration to an area of lower concentration 1 of 8 Which factors affect diffusion Temp, conc, size of molecule, thickness of membrane (longer pathway), surface area 2 of 8 What is active transport Movement of molecules using metabolic energy (ATP) 3 of 8 What is facilitated diffusion Passive movement of molecules across membranes down their conc gradient aided by transport proteins 4 of 8 What is bulk transport Movement of molecules cross a membrane by vesicles (ATP required) 5 of 8 Endocytosis Formation of vesicles by plasma membrane which moves molecules INTO the cell 6 of 8 Exocytosis Fusion of vesicles with plasma membrane which moves molecules OUT of the cell (If you also take chemistry remember exo and endo thermic) 7 of 8 What is osmosis Movement of water molecules from a region of higher water potential to a region of lower water potential across a partially permeable membrane 8 of 8
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