The blood after being pumped from the heart firstly goes to the lungs through the right atrium and the right ventricle valves, and the pulmonary arteries, where it gets cleaned of CO2, and it's oxygenated, to come back again to the hearth through the pulmonary veins, the left atrium, and the left ventricle, and the aorta to the rest of the body, as we can see in the picture below.
