PATHOLOGY

Detailed explanation-1: -Facilitated diffusion is a passive process: the solutes move down their concentration gradient and do not require the expenditure of cellular energy for this process.

Detailed explanation-2: -Diffusion expends no energy. Rather the different concentrations of materials in different areas are a form of potential energy, and diffusion is the dissipation of that potential energy as materials move down their concentration gradients, from high to low.

Detailed explanation-3: -Osmosis, facilitated diffusion and simple diffusion do not require energy.

Detailed explanation-4: -Similar to other mechanisms, the energy that fuels simple diffusion is kinetic energy and concentration gradient. In simple diffusion, the molecules struck each other. As a result, molecules are in random constant motion.

Detailed explanation-5: -The four main kinds of passive transport are simple diffusion, facilitated diffusion, filtration, and/or osmosis.