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When you inhale the air goes to the lung, and the heart process it to combine with the blood, the heart has four chambers with specific task to do, the atrium are receiving chambers of the heart , accepting blood from the body is the right atrium and from the lungs is the left atrium, although ventricles are pumping chambers , moving blood to the lungs is the right ventricle and into the body is the left ventricle.
so, you're referring the movement of oxygenated blood from left atrium to the left ventricle,  after the oxygenated blood processes in left ventricle and atrium it will goes on the aorta, then specifically the oxygenated blood carry on different organ in our body.