Which one of the following flow chart represents the correct sequence of blood flow in human beings?
1
Lungs → Pulmonary vein → heart → arteries → body → veins → heart → pulmonary artery → lungs
2
Lungs → Pulmonary artery → heart → arteries → body → veins → heart → pulmonary artery → lungs
3
Lungs → Pulmonary artery → heart → veins → body → arteries → heart → pulmonary vein → lungs
4
Lungs → Pulmonary vein → heart → veins → body → arteries → heart → pulmonary artery → lungs