What is the anatomical relationship between pulmonary artery and pulmonary veins ?

               Usually in the the vascular  system both artery and  vein  go together .It is an  irony in pulmonary circualtion  these two never go together .Another paradox is that pulmonary artery carries the most deoxygenated  blood and pulmonary vien carries the purest  form of blood in the entrie body , probably God has kept them widely seperated as  communication [...]

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