Question

Describe how cell permeability contributes to diffusion processes.

Answer 1

A medium that has high resistance to diffusion of water or a solute has a low cell permeability..

 J=PΔψ

Explanation:

1.The net movement from one point to another because of the random kinetic activities of molecules or ions is called diffusion

2.The rate of diffusion is given by a simple significant equation called Fick's first law  

                        J= Δψ/r

           where J =water flux density

                    Δψ= water potential gradient

                        r=resistance to diffusion

3. The flux is also inversely proportional to the resistance to diffusion encountered between water potential.

4. The cell permeability is simply the inverse of the resistance i.e.

                          P=1/r

Thus a medium that has high resistance to diffusion of water or a solute has a low cell permeability..

                           J=PΔψ