Simple Diffusion: This process occurs when molecules move from an area of high concentration to an area of low concentration directly through the lipid bilayer of the cell membrane. Non-polar and small polar molecules, such as oxygen and carbon dioxide, are typical examples. Facilitated Diffusion: This type of diffusion involves specific transmembrane transport proteins that help move substances across the membrane. Substances like glucose and ions, which cannot diffuse directly through the lipid bilayer, rely on these proteins. Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration, balancing solute concentrations on both sides of the membrane.
