how does blood circulate btw lungs and heart?

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Solution

The de-oxygenated blood from upper part of the body(via superior vena cava) and from the lower part of the body(via inferior vena cava) reaches the right auricle. From the right auricle blood is transported to right ventricle. From right ventricle blood reaches the lungs via pulmonary artery. In lung the blood is oxygenated and brought back to the left auricle by pulmonary vein and then it moves to left ventricle from where it is pumped to the whole body.

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