I don't know if it would be the wisest idea to rename it Membrane Excitability. Most people search for action potential. And quite frankly, this would be like taking the Ford article and renaming it the automobile article with the justification that Ford is just one manifestation of Automobiles. But it might be a good idea to create another section called Membrane Excitability. Another problem is that this article is already 100KB, at this stage we should consider splitting it up. If we make the article any bigger, it might be unmanageable.