Actin and Myosin

ID #2463

I don't really understand what was meant by "critical concentration" in lecture. Could someone provide a simple explanation of what Professor Mehrtens meant?

As you know, G actin can add onto or fall off of the end of a F actin filament. Steady state equilibrium will occur when no more G actin will add or fall off that end. So, the critical concentration is the amount (aka concentration) of G actin that is required to achieve steady state equilibrium. 
If you know the critical concentration of G actin for a filament and you are told in the question the concentration of G actin available near that end, you should be able to figure out if that means G actin would add onto, fall off of, or no change would occur (aka steady state) on the F actin filament. 

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