Place the following steps in order to describe the movement of blood through the heart.
4 options: Un-oxygenated blood flows from the vena cava into the right atrium. The oxygenated blood then returns to the left atrium and enters the left ventricle where it is pumped through the aorta to the systemic circulation. The right ventricle receives the blood and pumps it to the lungs for oxygenation.
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