Rate of diffusion Speed at which diffusion occurs > Dependent upon The magnitude of concentration gradient Driving force of diffusion Permeability of the membrane >Neuronal plasma membrane 20 x more permeable to K+ than na > Temperature >Higher temperature, faster diffusion rate Surface area of the membrane Microvilli increase surface area28 Rate of Diffusion ➢Speed at which diffusion occurs. ➢Dependent upon: ➢The magnitude of concentration gradient. ➢Driving force of diffusion. ➢Permeability of the membrane. ➢Neuronal plasma membrane 20 x more permeable to K+ than Na+ . ➢Temperature. ➢Higher temperature, faster diffusion rate. ➢Surface area of the membrane. ➢Microvilli increase surface area