And each pump contains an atrium and arabetrical. So let's take a look at the right atrium. The right atrium receives deoxnated blood from the systemic circulation of our cardiovascular system from the organs, the tissues and cells of our body. Now, once the blood fills the right atrium, it then moves into the right ventricle and it's the right ventricle that is responsible for creating that contraction and moving that deoxynated blood into the pulmonary circulation of the cardiovascular system into these pulmonary arteries that extend into the left lung and into the right lung. So we have the left lung here and we have the right lung here. Now, once our blood is inside the lung, it is oxygenated and then it moves into our left atrium via the pulmonary vein.