First of all, notice that the inner membrane actually consists these folding patterns. And the folding patterns create something called the Christy. Now, Christy are these inner foldings that greatly increases the surface area on which the electron transport chain can actually lie. And so we have a greater surface area as a result of these inner foldings. And so that means we can have many more of these electron transport chains and that greatly increases our cells ability to actually undergo oxidative phosphorylation. Now, the second important difference between the two membranes is the fact that the outer mitochondrial membrane contains these special mitochondrial pores, these special mitochondrial proteins called porns mitochondrial porins, also known as VDAC, where VDAC basically stands for voltage dependent and ionic complexes.