So these are the capillaries of the lungs. And so once the oxygen is deposited into our lungs, what happens is that deoxygenated blood returns via these pulmonary veins and it returns into the left vet, or the left atrium of the heart. So it travels this way along these pulmonary veins, and eventually it connects and it deposits into the left atrium of the heart. And so we see that we have a mixing of the oxygenated blood coming in from the right atrium and the deoxnated blood that is coming from the lungs and that mixes within the left atrium. Then that blood moves into the left ventricle of the heart. And when the left ventricle of the heart contracts, it forces all that blood to move into the systemic circulatory system, more specifically into this blood vessel here, known as our aorter.