And so protein complex one is actually a proton pump. And as these electrons move and ultimately end up on Ubiquinone, as we'll see in just a moment four H plus ions are actually pumped by protein complex one from the matrix side through the intermembering space of the mitochondrion. Now, as these electrons move, they ultimately end up on a carrier molecule known as coenzyme Q, or Ubiquinone. Now, Ubiquinone accepts two electrons and it also actually accepts two H plus ions. So it takes up two H plus ions from the matrix and it forms the fully reduced form of Ubiquinone, QH two, which is known as Ubiquinol. So once again, the electrons, once they abstract and biflavin mononucleotide then move along a series of iron sulfur groups shown here and are ultimately transferred to coenzyme Q Ubiquinone.