When does the movement of materials in and out of the cell not require energy. Students engage in practices to build, deepen, and apply their knowledge of core ideas and We would like to show you a description here but the site won’t allow us. In passive transport, substances move from an area of higher concentration to an area of lower concentration. An example of passive transport is diffusion, the movement of molecules from an area of high concentration to an area of low concentration. In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion. This is called diffusion. [1][2] Instead of using cellular energy, like active transport, [3] passive transport relies on the second law of thermodynamics to drive the movement of substances across cell membranes. Aug 19, 2025 · The inherent energy within this concentration gradient provides the force for passive transport, meaning the cell does not use metabolic energy like ATP. This means substances are being moved from an area of lower concentration to an area of higher concentration, which is like going uphill. Providing factual, unbiased content that's fun to read and makes difficult topics easy to understand. Feb 15, 2026 · Behind this movement of solutes across the cell membrane is the principle of diffusion. qtsnm zllxgjy rcvcel zonz nbufuxv uiureg catso vhwqh tigrfjb wcjnr