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Can EVERY molecule pass through the cell membrane freely? Why or why not? Cell Transport Module Review Sheet Passive Transport Main Idea Passive transport is the movement of molecules across the membrane from areas of higher concentration to areas of lower concentration. Materials move across membranes because of concentration differences. It does not require energy input from the cell. Diffusion Osmosis Think of an example of passive transport and list it here Facilitated Diffusion Active Transport occurs when a cell uses energy to move molecules against a concentration gradient. Molecules are moved from lower to higher concentration. It does require energy input from the cell. Endocytosis Cell membrane engulfs a substance and brings it inside the cell “Cell Eating” ENERGY REQUIRED LOW - HIGH Exocytosis The opposite of endocytosis removal of substances out of a cell by the fusion of a vesicle with the membrane. Sodium-Potassium Pump Movement of Na+ and K+ ions across a membrane through the use of a pump. Requires Energy in the form of ATP & a Carrier Protein Understanding Check Write the type of transport then indicate if energy is required or not required.