And each of these pumps consists of two different chambers. We have an atrium and we have a ventricle. So the right pump, found on the right side of the heart contains the right atrium and the right ventricle while the left pump contains the left ventricle and the left atrium that is found on the left side of our heart. Now, these two individual pumps are placed in serious with respect to one another. And what that means is they work together in a simultaneous way to create a movement of blood that is unidirectional and continuous. And this is exactly what we're going to focus on in this lecture.