The species theory, polygenism, held that human races were of different lineages and suggested a hierarchy outlined in the Chain of Being that positioned Africans between man and lower primates.
No, they are involved in the Circulatory System which is responsible for pumping and channelling blood to and from the body and lungs with heart, blood and blood vessels. no veins are not considered an organ because they are a grouping of different tissues like a organ.
Report Abuse. A vein is a blood vessel that carries blood TO the heart, FROM other organs. The pulmonary vein brings blood from the lungs after oxygenation. Other veins come from other parts, where the oxygen has already been used by the organs.he pulmonary artery (not the vein) carries oxygen rich blood it receives from the lungs to your heart. From there the heart distributes the oxygen rich blood throughout the rest of your body.