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.
Arteries, veins and nerves of the shoulder and upper arm. There are two prominent superficial veins of the upper limb; they are the cephalic and basilic veins, and these two extensive veins originate from the venous networks of the dorsum of the hand. The hand is drained by superficial and deep veins.