In diffusion, particles are being moved from a high concentration to a low concentration. As we experienced in class with the trash bag, particles in a solution are in continuous motion, but not all particles can get through to the other side. Because of the constant and random movement, the cell does not require the use of energy. Example of diffusion: Perfume bottle, the molecules move around from a high concentration to a low concentration. In Osmosis, water is being moved across a selectively permeable membrane from a high concentration to a low concentration, this process does not require energy. Example of osmosis: In a solution with salt (more concentrated) and water (less concentrated), the salt particles will move from a high concentration to a low concentration, the particles will even out between the water and the salt particles. However, in Active Transport, energy and a membrane protein is required and the particles go from a low concentration to a high concentration. Example of active transport: Sodium ions moving across a cell membrane. Protein membrane channels make it easier for certain particles to move across the membrane. Facilitated diffusion is like a faster rate of diffusion, except a protein membrane is required. In facilitated diffusion, specific particles are moved across cell membranes through protein channels, cell energy is not required. In the experiment in class with the membrane, glucose and water, the glucose moved through the membrane.