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.
1. Brescia-Cimino- radial artery-cephalic vein. 2. Snuffbox fistula- thenar (a group of muscles on the palm of the human hand at the base of the thumb) branch of the radial artery to cephalic vein. 3. Radial artery-basilic vein forearm transposition.