Facilitated diffusion, also called special diffusion, is the movement of molecules across the cell membrane via special transport proteins that are embedded within the cellular membrane. Many large molecules, such as glucose, are insoluble in lipids and too large to fit through the membrane pores. Therefore, it will bind with its specific carrier proteins, and the complex will then be bonded to a receptor site and moved through the cellular membrane. Bear in mind, however, that facilitated diffusion is a passive process, and the solutes still move down the diffusion of water molecules across a partially permeable membrane. The net movement of water molecules through a partially permeable membrane from a solution of high water potential to an area of low water potential. A cell with a less negative water potential will draw in water but this depends on other factors as well such as solute potential (pressure in the cell e.g. solute molecules) and pressure potential (external pressure e.g. cell wall)
Transpiration-Dependent Passive Silica Accumulation in Cucumber (Cucumis Sativus) under Varying Soil Silicon Availability
Oct 01, 2012; Introduction Silicon (Si) is a beneficial element for many higher plants, including important agricultural crops such as rice,...