Diffusion, The passive movement of molecules from a region of high concentration to low concentration., Facilitated diffusion, The passive movement of molecules across a membrane with the help of transport proteins., Passive transport, Movement of substances across a membrane without requiring energy., Concentration Gradient, The difference in concentration of a substance between two regions., Channel protein, A type of transport protein that forms a pore in the membrane for specific molecules or ions., Carrier protein, A type of transport protein that changes shape to move molecules across the membrane., Oxygen and carbon dioxide, Examples of molecules that diffuse directly through the membrane., Lipid bilayer, The structure of the cell membrane that allows small, non-polar molecules to pass through easily..

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