And that's why we have a slope that has a zero line that has a zero slope. And that's because within this section, what happens is our AV note essentially sends that electrical signal through the bundle of his and through our perkinji fibers. And within this segment, no contraction actually takes place. So once the AV node delays the signal, it depolarizes and sends the electrical signal through the bundle of his and our PerkinsI fibers that essentially permeate through the walls of our two ventricles, as shown by these purple fibers within this diagram, this does not actually cause any contraction. Now let's move on to this segment, the QRS segment, which is commonly known as the QRS complex. And this complex actually consists of three individual waves.