How Cell Membranes Regulate Ion Transport - Educational Diagram #45036 (License: Personal Use)

The left panel depicts an aqueous solution with freely dispersed sodium (green) and chloride (yellow) ions before a membrane is introduced. The right panel shows the same solution after a yellow membrane is inserted, with some ions now concentrated on one side-illustrating selective permeability and early-stage diffusion or equilibrium dynamics. Red particles may represent impermeable solutes or membrane-bound components.

Used in educational contexts-biology textbooks, online courses, or science outreach-to explain cellular transport mechanisms such as diffusion, osmosis, and the role of semi-permeable membranes. Matches user intent for visual learning of physiology or chemistry concepts.