All of the following transpo process follow 'saturation kinetics' except:
C i.e. Simple diffusionThe rate of diffusion in simple diffusion keeps on increasing propoionately with the concentration of the diffusing substance and does not follow saturation kinetics.While in other transpo mechanism, the rate of diffusion approaches a maximum, called Vmax, as the concentration of substance increases and then pleateu's off i.e. attains saturation at a paicular level. This is called saturation kinetics mechanismQ.Saturation kinetics will be seen in any transpo process which involves carrier proteins eg. facilitated diffusion and active transpoQ.- The rate at which a substance can be transpoed by these mechanism depends upon the rate at which the carrier protein can undergo conformational change between its active state & inactive state.- So the rate at which molecules can be transpoed by this mechanism can never be greater than the rate at which the carrier protein undergoes conformational change.- This limits the rate of transpo in these process.
Facilitated diffusion
Na+ - Cat. exchanger
Simple diffusion
Na+ coupled active transpo