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. And so what happened is these mitochondrial porins found on the outer membrane basically allowed the movement of anion molecules. So small molecules, which are anions. So things like chloride ions, things like ATP molecules, can actually move across the outer mitochondrial membrane from the cytoplasm into the intermembrane space without much difficulty.