Which row describes the correct direction of blood flow through the left side of the heart?
1 )
pulmonary artery → atrium → ventricle → vena cava
2 )
pulmonary artery → ventricle → atrium → aorta
3 )
pulmonary vein → ventricle → atrium → vena cava
pulmonary vein → atrium → ventricle → aorta
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