And we're examining the heart from a front side perspective. So we have the right side of the heart and the left side of the heart. Now, the right side of the heart contains the right pump that had the right atrium this chamber here, and the right ventricle, this chamber here, while the left side of the pump contains this left pump that contains our left atrium and our left ventricle. Now, we also have the four different types of valves. We have this right atrial ventricular valve, also known as the tricuspid valve. And we have the left atria ventricular valve, also known as the mitral or the Bicuspid valve.