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.,

Diffusion and facilitated diffusion

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