What is the correct order of blood flow through the blood vessels entering and leaving the heart?
1 )
aorta $ \to $ pulmonary artery $ \to $ pulmonary vein $ \to $ vena cava
2 )
aorta $ \to $ pulmonary vein $ \to $ pulmonary artery $ \to $ vena cava
vena cava $ \to $ pulmonary artery $ \to $ pulmonary vein $ \to $ aorta
4 )
vena cava $ \to $ pulmonary vein $ \to $ pulmonary artery $ \to $ aorta
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