ley del todo o nada all-or-none all or none Source all-or-none principle. ley del todo o nada “all or none” principle of muscle contraction. all or none law of nerve impulse all-or-none “all or none” principle of muscle contraction. all-or-none law “all or none” principle of muscle contraction. https://en.wikipedia.org/wiki/All-or-none_law