It causes contraction of the left ventricle closing this valve known as the mitral or the bicuspid valve. At the same time, it forces the opening of the aortic valve and it forces the movement of our oxygenated blood into the aorter of our body. And that aorta basically diverges into many smaller arteries and that moves our oxygenated blood into the rest of our body. And these two processes, one taking place in the right pump and the other one taking place in the left pump take place simultaneously at the same exact moment in time. So here we have the contraction of our right ventricle and the contraction of the left ventricle that takes place at the same exact moment in time. And if we examine these three stages these three stages basically take place over and over and over.